add FocusVisualStyle for some controls

src/Net_40/HandyControl_Net_40/Themes/Styles/Base/TreeViewBaseStyle.xaml

@@ -37,12 +37,11 @@
         </Setter>
     </Style>
 
-    <Style x:Key="TreeViewItemBaseStyle" TargetType="TreeViewItem">
+    <Style x:Key="TreeViewItemBaseStyle" BasedOn="{StaticResource BaseStyle}" TargetType="TreeViewItem">
+        <Setter Property="FocusVisualStyle" Value="{StaticResource FocusVisualRadius0Margin0}"/>
         <Setter Property="Background" Value="Transparent"/>
         <Setter Property="Padding" Value="10,0"/>
         <Setter Property="VerticalContentAlignment" Value="Center"/>
-        <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}"/>
-        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
         <Setter Property="BorderThickness" Value="0"/>
         <Setter Property="Template">
             <Setter.Value>
@@ -96,6 +95,7 @@
     </Style>
 
     <Style x:Key="TreeViewBaseStyle" TargetType="TreeView" BasedOn="{StaticResource BaseStyle}">
+        <Setter Property="Focusable" Value="False"/>
         <Setter Property="Background" Value="{DynamicResource RegionBrush}"/>
         <Setter Property="BorderBrush" Value="{DynamicResource BorderBrush}"/>
         <Setter Property="BorderThickness" Value="1"/>

src/Net_40/HandyControl_Net_40/Themes/Styles/DataGrid.xaml

@@ -25,7 +25,19 @@
     </Style>
 
     <Style x:Key="DataGridCellStyle" TargetType="DataGridCell">
-        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
+        <Setter Property="FocusVisualStyle">
+            <Setter.Value>
+                <Style>
+                    <Setter Property="Control.Template">
+                        <Setter.Value>
+                            <ControlTemplate>
+                                <Rectangle Margin="2" Opacity=".6" SnapsToDevicePixels="true" Stroke="{DynamicResource SecondaryBorderBrush}" StrokeThickness="2" StrokeDashArray="1 1" RadiusX="4" RadiusY="4"/>
+                            </ControlTemplate>
+                        </Setter.Value>
+                    </Setter>
+                </Style>
+            </Setter.Value>
+        </Setter>
         <Setter Property="Background" Value="Transparent"/>
         <Setter Property="BorderBrush" Value="Transparent"/>
         <Setter Property="BorderThickness" Value="0"/>
@@ -212,7 +224,7 @@
         <Setter Property="Template">
             <Setter.Value>
                 <ControlTemplate TargetType="ComboBox">
-                    <TextBlock IsHitTestVisible="False" Text="{TemplateBinding Text}" Focusable="True" TextTrimming="CharacterEllipsis"/>
+                    <TextBlock IsHitTestVisible="False" Text="{TemplateBinding Text}" TextTrimming="CharacterEllipsis"/>
                 </ControlTemplate>
             </Setter.Value>
         </Setter>

src/Net_40/HandyControl_Net_40/Themes/Styles/Growl.xaml

@@ -11,6 +11,7 @@
     </ResourceDictionary.MergedDictionaries>
 
     <Style TargetType="controls:Growl">
+        <Setter Property="Focusable" Value="False"/>
         <Setter Property="MinHeight" Value="60"/>
         <Setter Property="Width" Value="320"/>
         <Setter Property="Margin" Value="10,0,0,10"/>