diff --git a/HandyControl/Themes/Styles/Base/ComboBoxBaseStyle.xaml b/HandyControl/Themes/Styles/Base/ComboBoxBaseStyle.xaml
index fbc27e0f..174aa0e2 100644
--- a/HandyControl/Themes/Styles/Base/ComboBoxBaseStyle.xaml
+++ b/HandyControl/Themes/Styles/Base/ComboBoxBaseStyle.xaml
@@ -55,7 +55,9 @@
                         </Grid.ColumnDefinitions>
                         <Border x:Name="templateRoot" Grid.ColumnSpan="2" CornerRadius="{Binding Path=(controls:BorderElement.CornerRadius),RelativeSource={RelativeSource TemplatedParent}}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="true"/>
                         <Path Grid.Column="1" x:Name="arrow" Data="{StaticResource DownGeometry}" Stretch="Uniform" Fill="{TemplateBinding BorderBrush}" HorizontalAlignment="Center" Margin="7" VerticalAlignment="Center" RenderTransformOrigin="0.5,0.5"/>
-                        <ContentPresenter Grid.Column="0" Visibility="{Binding Text,RelativeSource={RelativeSource AncestorType=ComboBox},Converter={StaticResource String2VisibilityReConverter}}" Focusable="False" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
+                        <Border Margin="0,1" Grid.Column="0" Visibility="{Binding Text,RelativeSource={RelativeSource AncestorType=ComboBox},Converter={StaticResource String2VisibilityReConverter}}">
+                            <ContentPresenter Focusable="False" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
+                        </Border>
                     </Grid>
                     <ControlTemplate.Triggers>
                         <Trigger Property="IsChecked" Value="True">
@@ -213,8 +215,10 @@
                     </ScrollViewer>
                 </Border>
             </Popup>
-            <ToggleButton Grid.Column="1" x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxWatermarkToggleButton}"/>
-            <ContentPresenter Margin="8,8,2,7" Grid.Column="1" x:Name="contentPresenter" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" Content="{TemplateBinding SelectionBoxItem}" ContentStringFormat="{TemplateBinding SelectionBoxItemStringFormat}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" IsHitTestVisible="false" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
+            <ToggleButton Grid.Column="1" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" Content="{Binding Path=(controls:InfoElement.Placeholder),RelativeSource={RelativeSource TemplatedParent}}" x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxWatermarkToggleButton}"/>
+            <Border Grid.Column="1" Margin="1,0">
+                <ContentPresenter Margin="{TemplateBinding Padding}" x:Name="contentPresenter" ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}" ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}" Content="{TemplateBinding SelectionBoxItem}" ContentStringFormat="{TemplateBinding SelectionBoxItemStringFormat}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" IsHitTestVisible="false" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
+            </Border>
         </Grid>
         <ControlTemplate.Triggers>
             <Trigger Property="HasItems" Value="false">
@@ -287,7 +291,7 @@
                 </Border>
             </Popup>
             <ToggleButton Grid.Column="0" x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxToggleButton}"/>
-            <Border Grid.Column="0" x:Name="border" Margin="-1,0">
+            <Border Grid.Column="0" x:Name="border" Margin="-1,1">
                 <TextBox x:Name="PART_EditableTextBox" Padding="{TemplateBinding Padding}" Background="{TemplateBinding Background}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" IsReadOnly="{Binding IsReadOnly, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxEditableTextBox}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
             </Border>
         </Grid>
@@ -353,9 +357,7 @@
                 </Border>
             </Popup>
             <ToggleButton Grid.Row="1" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" Content="{Binding Path=(controls:InfoElement.Placeholder),RelativeSource={RelativeSource TemplatedParent}}" Grid.Column="0" x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxWatermarkToggleButton}"/>
-            <!--<ToggleButton Grid.Row="1" Grid.Column="0" x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxToggleButton}"/>
-            <TextBlock x:Name="Placeholder" Margin="8,7,8,8" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Grid.Column="0" Grid.Row="1" Visibility="{TemplateBinding Text,Converter={StaticResource String2VisibilityReConverter}}" HorizontalAlignment="Stretch" Style="{StaticResource TextBlockDefaultThiLight}" Text="{Binding Path=(controls:InfoElement.Placeholder),RelativeSource={RelativeSource TemplatedParent}}"/>-->
-            <Border Grid.Row="1" Grid.Column="0" x:Name="border" Margin="-1,0">
+            <Border Grid.Row="1" Grid.Column="0" x:Name="border" Margin="-1,1">
                 <TextBox x:Name="PART_EditableTextBox" Padding="{TemplateBinding Padding}" Background="{TemplateBinding Background}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" IsReadOnly="{Binding IsReadOnly, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxEditableTextBox}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
             </Border>
         </Grid>
@@ -418,10 +420,9 @@
                     </ScrollViewer>
                 </Border>
             </Popup>
-            <ToggleButton Grid.Column="1" x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxToggleButton}"/>
-            <TextBlock x:Name="Placeholder" Margin="8,7,8,8" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" Grid.Column="1" Visibility="{TemplateBinding Text,Converter={StaticResource String2VisibilityReConverter}}" HorizontalAlignment="Stretch" Style="{StaticResource TextBlockDefaultThiLight}" Text="{Binding Path=(controls:InfoElement.Placeholder),RelativeSource={RelativeSource TemplatedParent}}"/>
-            <Border Grid.Column="1" x:Name="border" Background="Transparent" Margin="4,1">
-                <TextBox Padding="2,6,2,7" x:Name="PART_EditableTextBox" Background="{TemplateBinding Background}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" IsReadOnly="{Binding IsReadOnly, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxEditableTextBox}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
+            <ToggleButton Grid.Column="1" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" Content="{Binding Path=(controls:InfoElement.Placeholder),RelativeSource={RelativeSource TemplatedParent}}" x:Name="toggleButton" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Grid.ColumnSpan="2" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxWatermarkToggleButton}"/>
+            <Border Grid.Column="1" x:Name="border" Background="Transparent" Margin="-1,1">
+                <TextBox x:Name="PART_EditableTextBox" Padding="{TemplateBinding Padding}" Background="{TemplateBinding Background}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" IsReadOnly="{Binding IsReadOnly, RelativeSource={RelativeSource TemplatedParent}}" Style="{StaticResource ComboBoxEditableTextBox}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
             </Border>
         </Grid>
         <ControlTemplate.Triggers>
@@ -458,7 +459,6 @@
             </Trigger>
             <Trigger Property="IsEnabled" Value="false">
                 <Setter Property="Opacity" Value="0.4" TargetName="toggleButton"/>
-                <Setter Property="Opacity" Value="0.4" TargetName="Placeholder"/>
                 <Setter Property="Opacity" Value="0.4" TargetName="border"/>
             </Trigger>
         </ControlTemplate.Triggers>
diff --git a/HandyControlDemo/UserControl/Styles/NaiveComboBoxDemoCtl.xaml b/HandyControlDemo/UserControl/Styles/NaiveComboBoxDemoCtl.xaml
index b8c98081..377a8d1f 100644
--- a/HandyControlDemo/UserControl/Styles/NaiveComboBoxDemoCtl.xaml
+++ b/HandyControlDemo/UserControl/Styles/NaiveComboBoxDemoCtl.xaml
@@ -14,7 +14,7 @@
 
                 <ComboBox ItemsSource="{Binding DataList}" SelectedIndex="0" controls:InfoElement.Title="{x:Static langs:Lang.TitleDemoStr1}" Style="{StaticResource ComboBoxExtend}" Margin="0,32,0,0" Text="{x:Static langs:Lang.ContentDemoStr}"/>
                 <ComboBox ItemsSource="{Binding DataList}" controls:InfoElement.Placeholder="{x:Static langs:Lang.PlsEnterContent}" controls:InfoElement.Title="{x:Static langs:Lang.TitleDemoStr2}" Style="{StaticResource ComboBoxExtend}" controls:InfoElement.Necessary="True" Margin="0,16,0,0"/>
-                <ComboBox FontSize="20" controls:InfoElement.ContentHeight="38" Padding="0" VerticalContentAlignment="Bottom" ItemsSource="{Binding DataList}" IsEditable="True" SelectedIndex="0" controls:InfoElement.Title="{x:Static langs:Lang.TitleDemoStr1}" Style="{StaticResource ComboBoxExtend}" Margin="0,16,0,0" Text="{x:Static langs:Lang.ContentDemoStr}"/>
+                <ComboBox ItemsSource="{Binding DataList}" IsEditable="True" SelectedIndex="0" controls:InfoElement.Title="{x:Static langs:Lang.TitleDemoStr1}" Style="{StaticResource ComboBoxExtend}" Margin="0,16,0,0" Text="{x:Static langs:Lang.ContentDemoStr}"/>
                 <ComboBox ItemsSource="{Binding DataList}" IsEditable="True" controls:InfoElement.Placeholder="{x:Static langs:Lang.PlsEnterContent}" controls:InfoElement.Title="{x:Static langs:Lang.TitleDemoStr2}" Style="{StaticResource ComboBoxExtend}" controls:InfoElement.Necessary="True" Margin="0,16,0,0"/>
 
                 <ComboBox ItemsSource="{Binding DataList}" Width="380" controls:InfoElement.TitleWidth="140" controls:InfoElement.TitleAlignment="Left" controls:InfoElement.Title="{x:Static langs:Lang.TitleDemoStr3}" Style="{StaticResource ComboBoxExtend}" Margin="0,32,0,0" Text="{x:Static langs:Lang.ContentDemoStr}"/>