add ignoreTextChanged

src/Shared/HandyControl_Shared/Collections/ManualObservableCollection`1.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Collections.ObjectModel;
 using System.Collections.Specialized;
 using System.ComponentModel;
@@ -41,6 +42,19 @@ namespace HandyControl.Collections
             }
         }
 
+        public ManualObservableCollection()
+        {
+            
+        }
+
+        public ManualObservableCollection(List<T> list) : base(list != null ? new List<T>(list.Count) : list) => CopyFrom(list);
+
+        public ManualObservableCollection(IEnumerable<T> collection)
+        {
+            if (collection == null) throw new ArgumentNullException(nameof(collection));
+            CopyFrom(collection);
+        }
+
         protected override void OnPropertyChanged(PropertyChangedEventArgs e)
         {
             if (!CanNotify) return;
@@ -54,5 +68,18 @@ namespace HandyControl.Collections
 
             base.OnCollectionChanged(e);
         }
+
+        private void CopyFrom(IEnumerable<T> collection)
+        {
+            var items = Items;
+            if (collection != null)
+            {
+                using var enumerator = collection.GetEnumerator();
+                while (enumerator.MoveNext())
+                {
+                    items.Add(enumerator.Current);
+                }
+            }
+        }
     }
 }

src/Shared/HandyControl_Shared/Controls/Input/AutoCompleteTextBox/AutoCompleteTextBox.cs

@@ -0,0 +1,150 @@
+using System;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
+using HandyControl.Data;
+using HandyControl.Tools.Helper;
+
+namespace HandyControl.Controls
+{
+    [TemplatePart(Name = SearchTextBox, Type = typeof(System.Windows.Controls.TextBox))]
+    public class AutoCompleteTextBox : ComboBox
+    {
+        private const string SearchTextBox = "PART_SearchTextBox";
+
+        private bool ignoreTextChanging;
+
+        private System.Windows.Controls.TextBox _searchTextBox;
+
+        private object _selectedItem;
+
+        static AutoCompleteTextBox()
+        {
+            TextProperty.OverrideMetadata(typeof(AutoCompleteTextBox), new FrameworkPropertyMetadata(default(string), FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
+        }
+
+        public override void OnApplyTemplate()
+        {
+            if (_searchTextBox != null)
+            {
+                _searchTextBox.GotFocus -= SearchTextBoxGotFocus;
+                _searchTextBox.KeyDown -= SearchTextBoxKeyDown;
+                _searchTextBox.TextChanged -= SearchTextBoxTextChanged;
+            }
+
+            base.OnApplyTemplate();
+
+            _searchTextBox = GetTemplateChild(SearchTextBox) as System.Windows.Controls.TextBox;
+            if (_searchTextBox != null)
+            {
+                _searchTextBox.GotFocus += SearchTextBoxGotFocus;
+                _searchTextBox.PreviewKeyDown += SearchTextBoxKeyDown;
+                _searchTextBox.TextChanged += SearchTextBoxTextChanged;
+            }
+        }
+
+        protected override void OnSelectionChanged(SelectionChangedEventArgs e)
+        {
+            if (e.AddedItems.Count > 0)
+            {
+                _selectedItem = e.AddedItems[0];
+            }
+        }
+
+        protected override void OnDropDownClosed(EventArgs e)
+        {
+            base.OnDropDownClosed(e);
+
+            if (ItemContainerGenerator.ContainerFromItem(_selectedItem) is AutoCompleteTextBoxItem boxItem)
+            {
+                ignoreTextChanging = true;
+
+                _searchTextBox.Text = BindingHelper.GetString(boxItem.Content, DisplayMemberPath);
+                _searchTextBox.CaretIndex = _searchTextBox.Text.Length;
+
+                ignoreTextChanging = true;
+
+                Text = _searchTextBox.Text;
+
+                ignoreTextChanging = false;
+            }
+        }
+
+        protected override bool IsItemItsOwnContainerOverride(object item) => item is AutoCompleteTextBoxItem;
+
+        protected override DependencyObject GetContainerForItemOverride() => new AutoCompleteTextBoxItem();
+
+        private void SearchTextBoxTextChanged(object sender, TextChangedEventArgs e)
+        {
+            _selectedItem = null;
+            SelectedIndex = -1;
+
+            if (ignoreTextChanging)
+            {
+                ignoreTextChanging = false;
+                return;
+            }
+
+            Text = _searchTextBox.Text;
+            if (string.IsNullOrEmpty(Text))
+            {
+                SetCurrentValue(IsDropDownOpenProperty, ValueBoxes.FalseBox);
+                _searchTextBox.Focus();
+            }
+            else if (_searchTextBox.IsFocused)
+            {
+                SetCurrentValue(IsDropDownOpenProperty, ValueBoxes.TrueBox);
+            }
+        }
+
+        private void SearchTextBoxKeyDown(object sender, KeyEventArgs e)
+        {
+            if (e.Key == Key.Up)
+            {
+                var index = SelectedIndex - 1;
+                if (index < 0)
+                {
+                    index = Items.Count - 1;
+                }
+
+                UpdateTextBoxBySelectedIndex(index);
+            }
+            else if (e.Key == Key.Down)
+            {
+                var index = SelectedIndex + 1;
+                if (index >= Items.Count)
+                {
+                    index = 0;
+                }
+
+                UpdateTextBoxBySelectedIndex(index);
+            }
+            else if (e.Key == Key.Enter)
+            {
+                SetCurrentValue(IsDropDownOpenProperty, ValueBoxes.FalseBox);
+                e.Handled = true;
+            }
+        }
+
+        private void UpdateTextBoxBySelectedIndex(int selectedIndex)
+        {
+            ignoreTextChanging = true;
+
+            if (ItemContainerGenerator.ContainerFromIndex(selectedIndex) is AutoCompleteTextBoxItem boxItem)
+            {
+                _searchTextBox.Text = BindingHelper.GetString(boxItem.Content, DisplayMemberPath);
+                _searchTextBox.CaretIndex = _searchTextBox.Text.Length;
+
+                SelectedIndex = selectedIndex;
+            }
+        }
+
+        private void SearchTextBoxGotFocus(object sender, RoutedEventArgs e)
+        {
+            if (!string.IsNullOrEmpty(Text))
+            {
+                SetCurrentValue(IsDropDownOpenProperty, ValueBoxes.TrueBox);
+            }
+        }
+    }
+}

src/Shared/HandyControl_Shared/Controls/Input/AutoCompleteTextBox/AutoCompleteTextBoxItem.cs

@@ -0,0 +1,9 @@
+using System.Windows.Controls;
+
+namespace HandyControl.Controls
+{
+    public class AutoCompleteTextBoxItem : ComboBoxItem
+    {
+        
+    }
+}

src/Shared/HandyControl_Shared/HandyControl_Shared.projitems

@@ -35,6 +35,8 @@
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Drawer\DrawerContainer.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Growl\GrowlWindow.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Image\ImageBlock.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Controls\Input\AutoCompleteTextBox\AutoCompleteTextBox.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Controls\Input\AutoCompleteTextBox\AutoCompleteTextBoxItem.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Input\CheckComboBox\CheckComboBox.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Input\CheckComboBox\CheckComboBoxItem.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Input\ImageSelector.cs" />
@@ -369,6 +371,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Generator\HatchBrushGenerator.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Helper\AnimationHelper.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Helper\ArithmeticHelper.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Tools\Helper\BindingHelper.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Helper\ColorHelper.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Helper\ConfigHelper.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Helper\DesignerHelper.cs" />
@@ -416,6 +419,12 @@
     <None Include="$(MSBuildThisFileDirectory)Themes\Basic\Brushes.xaml">
       <SubType>Designer</SubType>
     </None>
+    <None Include="$(MSBuildThisFileDirectory)Themes\Styles\AutoCompleteTextBox.xaml">
+      <SubType>Designer</SubType>
+    </None>
+    <None Include="$(MSBuildThisFileDirectory)Themes\Styles\Base\AutoCompleteTextBoxBaseStyle.xaml">
+      <SubType>Designer</SubType>
+    </None>
     <None Include="$(MSBuildThisFileDirectory)Themes\XamlCombine.exe" />
     <Page Include="$(MSBuildThisFileDirectory)Themes\Basic\Colors\Colors.xaml">
       <SubType>Designer</SubType>

src/Shared/HandyControl_Shared/Themes/Styles/AutoCompleteTextBox.xaml

@@ -0,0 +1,6 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:hc="clr-namespace:HandyControl.Controls">
+
+    <Style BasedOn="{StaticResource AutoCompleteTextBoxBaseStyle}" TargetType="hc:AutoCompleteTextBox"/>
+
+</ResourceDictionary>

src/Shared/HandyControl_Shared/Themes/Styles/Base/AutoCompleteTextBoxBaseStyle.xaml

@@ -0,0 +1,115 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
+                    xmlns:hc="clr-namespace:HandyControl.Controls">
+
+    <Style x:Key="AutoCompleteTextBoxInternal" BasedOn="{StaticResource ComboBoxEditableTextBox}" TargetType="TextBox"/>
+
+    <Style x:Key="AutoCompleteTextBoxItemBaseStyle" TargetType="ComboBoxItem">
+        <Setter Property="Padding" Value="{StaticResource DefaultControlPadding}"/>
+        <Setter Property="SnapsToDevicePixels" Value="True"/>
+        <Setter Property="Background" Value="Transparent"/>
+        <Setter Property="BorderBrush" Value="Transparent"/>
+        <Setter Property="BorderThickness" Value="0"/>
+        <Setter Property="MinHeight" Value="{StaticResource DefaultControlHeight}"/>
+        <Setter Property="Focusable" Value="False"/>
+        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="ComboBoxItem">
+                    <Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
+                        <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
+                    </Border>
+                    <ControlTemplate.Triggers>
+                        <MultiTrigger>
+                            <MultiTrigger.Conditions>
+                                <Condition Property="IsSelected" Value="False"/>
+                                <Condition Property="IsMouseOver" Value="True"/>
+                            </MultiTrigger.Conditions>
+                            <Setter Property="Background" TargetName="Bd" Value="{DynamicResource SecondaryRegionBrush}"/>
+                        </MultiTrigger>
+                        <Trigger Property="IsSelected" Value="True">
+                            <Setter Property="Background" TargetName="Bd" Value="{DynamicResource PrimaryBrush}"/>
+                            <Setter Property="Foreground" Value="White"/>
+                        </Trigger>
+                    </ControlTemplate.Triggers>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </Style>
+
+    <Style x:Key="AutoCompleteTextBoxBaseStyle" TargetType="hc:AutoCompleteTextBox">
+        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
+        <Setter Property="Background" Value="{DynamicResource RegionBrush}"/>
+        <Setter Property="hc:BorderElement.CornerRadius" Value="{StaticResource DefaultCornerRadius}"/>
+        <Setter Property="BorderBrush" Value="{DynamicResource BorderBrush}"/>
+        <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}"/>
+        <Setter Property="BorderThickness" Value="1"/>
+        <Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto"/>
+        <Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
+        <Setter Property="MinHeight" Value="{StaticResource DefaultControlHeight}"/>
+        <Setter Property="ScrollViewer.CanContentScroll" Value="true"/>
+        <Setter Property="ScrollViewer.PanningMode" Value="Both"/>
+        <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
+        <Setter Property="Padding" Value="{StaticResource DefaultInputPadding}"/>
+        <Setter Property="VerticalContentAlignment" Value="Center"/>
+        <Setter Property="Validation.ErrorTemplate" Value="{x:Null}"/>
+        <Setter Property="ItemContainerStyle" Value="{StaticResource AutoCompleteTextBoxItemBaseStyle}"/>
+        <Setter Property="IsTabStop" Value="false"/>
+        <Setter Property="hc:Empty.ShowEmpty" Value="True"/>
+        <Setter Property="Template">
+            <Setter.Value>
+                <ControlTemplate TargetType="hc:AutoCompleteTextBox">
+                    <hc:SimplePanel>
+                        <Border CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="true">
+                            <TextBox x:Name="PART_SearchTextBox" Padding="{TemplateBinding Padding}" Style="{StaticResource AutoCompleteTextBoxInternal}"/>
+                        </Border>
+                        <Popup x:Name="PART_Popup" AllowsTransparency="true" IsOpen="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Margin="1" PopupAnimation="{StaticResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">
+                            <Border BorderThickness="0,1,0,0" Effect="{StaticResource EffectShadow2}" Margin="8,0,8,8" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" x:Name="dropDownBorder" MinWidth="{Binding ActualWidth, ElementName=toggleButton}" MaxHeight="{TemplateBinding MaxDropDownHeight}" BorderBrush="{DynamicResource BorderBrush}" Background="{DynamicResource RegionBrush}">
+                                <hc:ToggleBlock IsChecked="{Binding HasItems,RelativeSource={RelativeSource TemplatedParent},Mode=OneWay}" VerticalContentAlignment="Stretch" HorizontalContentAlignment="Stretch">
+                                    <hc:ToggleBlock.CheckedContent>
+                                        <ScrollViewer Margin="0,4">
+                                            <ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
+                                        </ScrollViewer>
+                                    </hc:ToggleBlock.CheckedContent>
+                                    <hc:ToggleBlock.UnCheckedContent>
+                                        <hc:Empty/>
+                                    </hc:ToggleBlock.UnCheckedContent>
+                                </hc:ToggleBlock>
+                            </Border>
+                        </Popup>
+                    </hc:SimplePanel>
+                    <ControlTemplate.Triggers>
+                        <Trigger Property="HasItems" Value="false">
+                            <Setter Property="Height" TargetName="dropDownBorder" Value="95"/>
+                        </Trigger>
+                        <Trigger Property="hc:DropDownElement.ConsistentWidth" Value="True">
+                            <Setter Property="MaxWidth" TargetName="dropDownBorder" Value="{Binding ActualWidth, ElementName=PART_SearchTextBox}"/>
+                            <Setter Property="MinWidth" TargetName="dropDownBorder" Value="{Binding ActualWidth, ElementName=PART_SearchTextBox}"/>
+                        </Trigger>
+                        <Trigger Property="hc:DropDownElement.AutoWidth" Value="True">
+                            <Setter Property="MaxWidth" TargetName="dropDownBorder" Value="{x:Static system:Double.MaxValue}" />
+                            <Setter Property="MinWidth" TargetName="dropDownBorder" Value="{Binding ActualHeight, ElementName=PART_SearchTextBox}" />
+                        </Trigger>
+                        <Trigger Property="IsMouseOver" Value="true" SourceName="PART_SearchTextBox">
+                            <Setter Property="BorderBrush" Value="{DynamicResource SecondaryBorderBrush}"/>
+                        </Trigger>
+                        <MultiTrigger>
+                            <MultiTrigger.Conditions>
+                                <Condition Property="IsMouseOver" Value="true"/>
+                                <Condition Property="IsFocused" Value="false" SourceName="PART_SearchTextBox"/>
+                            </MultiTrigger.Conditions>
+                            <Setter Property="BorderBrush" Value="{DynamicResource SecondaryBorderBrush}"/>
+                        </MultiTrigger>
+                        <Trigger Property="IsFocused" Value="True" SourceName="PART_SearchTextBox">
+                            <Setter Property="BorderBrush" Value="{DynamicResource PrimaryBrush}"/>
+                        </Trigger>
+                        <Trigger Property="IsEnabled" Value="false">
+                            <Setter Property="Opacity" Value="0.4"/>
+                        </Trigger>
+                    </ControlTemplate.Triggers>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </Style>
+
+</ResourceDictionary>

src/Shared/HandyControl_Shared/Themes/Theme.xaml

@@ -11383,6 +11383,113 @@
 			</Setter.Value>
 		</Setter>
 	</Style>
+	<Style x:Key="AutoCompleteTextBoxInternal" BasedOn="{StaticResource ComboBoxEditableTextBox}" TargetType="TextBox" />
+	<Style x:Key="AutoCompleteTextBoxItemBaseStyle" TargetType="ComboBoxItem">
+		<Setter Property="Padding" Value="{StaticResource DefaultControlPadding}" />
+		<Setter Property="SnapsToDevicePixels" Value="True" />
+		<Setter Property="Background" Value="Transparent" />
+		<Setter Property="BorderBrush" Value="Transparent" />
+		<Setter Property="BorderThickness" Value="0" />
+		<Setter Property="MinHeight" Value="{StaticResource DefaultControlHeight}" />
+		<Setter Property="Focusable" Value="False" />
+		<Setter Property="FocusVisualStyle" Value="{x:Null}" />
+		<Setter Property="Template">
+			<Setter.Value>
+				<ControlTemplate TargetType="ComboBoxItem">
+					<Border x:Name="Bd" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Padding="{TemplateBinding Padding}" SnapsToDevicePixels="true">
+						<ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
+					</Border>
+					<ControlTemplate.Triggers>
+						<MultiTrigger>
+							<MultiTrigger.Conditions>
+								<Condition Property="IsSelected" Value="False" />
+								<Condition Property="IsMouseOver" Value="True" />
+							</MultiTrigger.Conditions>
+							<Setter Property="Background" TargetName="Bd" Value="{DynamicResource SecondaryRegionBrush}" />
+						</MultiTrigger>
+						<Trigger Property="IsSelected" Value="True">
+							<Setter Property="Background" TargetName="Bd" Value="{DynamicResource PrimaryBrush}" />
+							<Setter Property="Foreground" Value="White" />
+						</Trigger>
+					</ControlTemplate.Triggers>
+				</ControlTemplate>
+			</Setter.Value>
+		</Setter>
+	</Style>
+	<Style x:Key="AutoCompleteTextBoxBaseStyle" TargetType="hc:AutoCompleteTextBox">
+		<Setter Property="FocusVisualStyle" Value="{x:Null}" />
+		<Setter Property="Background" Value="{DynamicResource RegionBrush}" />
+		<Setter Property="hc:BorderElement.CornerRadius" Value="{StaticResource DefaultCornerRadius}" />
+		<Setter Property="BorderBrush" Value="{DynamicResource BorderBrush}" />
+		<Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}" />
+		<Setter Property="BorderThickness" Value="1" />
+		<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto" />
+		<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto" />
+		<Setter Property="MinHeight" Value="{StaticResource DefaultControlHeight}" />
+		<Setter Property="ScrollViewer.CanContentScroll" Value="true" />
+		<Setter Property="ScrollViewer.PanningMode" Value="Both" />
+		<Setter Property="Stylus.IsFlicksEnabled" Value="False" />
+		<Setter Property="Padding" Value="{StaticResource DefaultInputPadding}" />
+		<Setter Property="VerticalContentAlignment" Value="Center" />
+		<Setter Property="Validation.ErrorTemplate" Value="{x:Null}" />
+		<Setter Property="ItemContainerStyle" Value="{StaticResource AutoCompleteTextBoxItemBaseStyle}" />
+		<Setter Property="IsTabStop" Value="false" />
+		<Setter Property="hc:Empty.ShowEmpty" Value="True" />
+		<Setter Property="Template">
+			<Setter.Value>
+				<ControlTemplate TargetType="hc:AutoCompleteTextBox">
+					<hc:SimplePanel>
+						<Border CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="true">
+							<TextBox x:Name="PART_SearchTextBox" Padding="{TemplateBinding Padding}" Style="{StaticResource AutoCompleteTextBoxInternal}" />
+						</Border>
+						<Popup x:Name="PART_Popup" AllowsTransparency="true" IsOpen="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Margin="1" PopupAnimation="{StaticResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}" Placement="Bottom">
+							<Border BorderThickness="0,1,0,0" Effect="{StaticResource EffectShadow2}" Margin="8,0,8,8" CornerRadius="{Binding Path=(hc:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" x:Name="dropDownBorder" MinWidth="{Binding ActualWidth, ElementName=toggleButton}" MaxHeight="{TemplateBinding MaxDropDownHeight}" BorderBrush="{DynamicResource BorderBrush}" Background="{DynamicResource RegionBrush}">
+								<hc:ToggleBlock IsChecked="{Binding HasItems,RelativeSource={RelativeSource TemplatedParent},Mode=OneWay}" VerticalContentAlignment="Stretch" HorizontalContentAlignment="Stretch">
+									<hc:ToggleBlock.CheckedContent>
+										<ScrollViewer Margin="0,4">
+											<ItemsPresenter x:Name="ItemsPresenter" KeyboardNavigation.DirectionalNavigation="Contained" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" />
+										</ScrollViewer>
+									</hc:ToggleBlock.CheckedContent>
+									<hc:ToggleBlock.UnCheckedContent>
+										<hc:Empty />
+									</hc:ToggleBlock.UnCheckedContent>
+								</hc:ToggleBlock>
+							</Border>
+						</Popup>
+					</hc:SimplePanel>
+					<ControlTemplate.Triggers>
+						<Trigger Property="HasItems" Value="false">
+							<Setter Property="Height" TargetName="dropDownBorder" Value="95" />
+						</Trigger>
+						<Trigger Property="hc:DropDownElement.ConsistentWidth" Value="True">
+							<Setter Property="MaxWidth" TargetName="dropDownBorder" Value="{Binding ActualWidth, ElementName=PART_SearchTextBox}" />
+							<Setter Property="MinWidth" TargetName="dropDownBorder" Value="{Binding ActualWidth, ElementName=PART_SearchTextBox}" />
+						</Trigger>
+						<Trigger Property="hc:DropDownElement.AutoWidth" Value="True">
+							<Setter Property="MaxWidth" TargetName="dropDownBorder" Value="{x:Static system:Double.MaxValue}" />
+							<Setter Property="MinWidth" TargetName="dropDownBorder" Value="{Binding ActualHeight, ElementName=PART_SearchTextBox}" />
+						</Trigger>
+						<Trigger Property="IsMouseOver" Value="true" SourceName="PART_SearchTextBox">
+							<Setter Property="BorderBrush" Value="{DynamicResource SecondaryBorderBrush}" />
+						</Trigger>
+						<MultiTrigger>
+							<MultiTrigger.Conditions>
+								<Condition Property="IsMouseOver" Value="true" />
+								<Condition Property="IsFocused" Value="false" SourceName="PART_SearchTextBox" />
+							</MultiTrigger.Conditions>
+							<Setter Property="BorderBrush" Value="{DynamicResource SecondaryBorderBrush}" />
+						</MultiTrigger>
+						<Trigger Property="IsFocused" Value="True" SourceName="PART_SearchTextBox">
+							<Setter Property="BorderBrush" Value="{DynamicResource PrimaryBrush}" />
+						</Trigger>
+						<Trigger Property="IsEnabled" Value="false">
+							<Setter Property="Opacity" Value="0.4" />
+						</Trigger>
+					</ControlTemplate.Triggers>
+				</ControlTemplate>
+			</Setter.Value>
+		</Setter>
+	</Style>
 	<Style BasedOn="{StaticResource BadgeBaseStyle}" TargetType="hc:Badge">
 		<Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}" />
 	</Style>
@@ -13028,6 +13135,7 @@
 	<Style BasedOn="{StaticResource TreeViewItemBaseStyle}" TargetType="TreeViewItem" />
 	<Style BasedOn="{StaticResource TreeViewBaseStyle}" TargetType="TreeView" />
 	<Style BasedOn="{StaticResource WatermarkBaseStyle}" TargetType="hc:Watermark" />
+	<Style BasedOn="{StaticResource AutoCompleteTextBoxBaseStyle}" TargetType="hc:AutoCompleteTextBox" />
 	<ControlTemplate x:Key="TipSliderThumbHorizontalTop" TargetType="Thumb">
 		<hc:AxleCanvas>
 			<Label Name="LabelValue" IsHitTestVisible="False" Opacity="0" Canvas.Bottom="28" Style="{StaticResource LabelPrimary}" Content="{Binding Value,RelativeSource={RelativeSource AncestorType=Slider}}" ContentStringFormat="{Binding Path=(hc:TipElement.StringFormat),RelativeSource={RelativeSource AncestorType=Slider}}" />

src/Shared/HandyControl_Shared/Themes/Theme_40.txt

@@ -116,6 +116,7 @@ Styles\Base\ToolTipBaseStyle.xaml
 Styles\Base\TransferBaseStyle.xaml
 ..\..\..\Net_40\HandyControl_Net_40\Themes\Styles\Base\TreeViewBaseStyle.xaml
 Styles\Base\WatermarkBaseStyle.xaml
+Styles\Base\AutoCompleteTextBoxBaseStyle.xaml
 # --------------------------------------
 Styles\Badge.xaml
 Styles\CalendarWithClock.xaml
@@ -183,3 +184,4 @@ Styles\Transfer.xaml
 Styles\TransitioningContentControl.xaml
 Styles\TreeView.xaml
 Styles\Watermark.xaml
+Styles\AutoCompleteTextBox.xaml

src/Shared/HandyControl_Shared/Themes/Theme_GE45.txt

@@ -116,6 +116,7 @@ Styles\Base\ToolTipBaseStyle.xaml
 Styles\Base\TransferBaseStyle.xaml
 Styles\Base\TreeViewBaseStyle.xaml
 Styles\Base\WatermarkBaseStyle.xaml
+Styles\Base\AutoCompleteTextBoxBaseStyle.xaml
 # --------------------------------------
 Styles\Badge.xaml
 Styles\CalendarWithClock.xaml
@@ -183,3 +184,4 @@ Styles\Transfer.xaml
 Styles\TransitioningContentControl.xaml
 Styles\TreeView.xaml
 Styles\Watermark.xaml
+Styles\AutoCompleteTextBox.xaml

src/Shared/HandyControl_Shared/Tools/Helper/BindingHelper.cs

@@ -0,0 +1,31 @@
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+
+namespace HandyControl.Tools.Helper
+{
+    public class BindingHelper
+    {
+        public static string GetString(object source, string path)
+        {
+            if (string.IsNullOrEmpty(path))
+            {
+                return source == null ? string.Empty : source.ToString();
+            }
+
+            var tempObj = new DependencyObject();
+
+            var binding = new Binding(path)
+            {
+                Mode = BindingMode.OneTime,
+                Source = source
+            };
+
+            BindingOperations.SetBinding(tempObj, TextSearch.TextProperty, binding);
+            var result = (string) tempObj.GetValue(TextSearch.TextProperty);
+
+            BindingOperations.ClearBinding(tempObj, TextSearch.TextProperty);
+            return result;
+        }
+    }
+}