add FocusVisualStyle for some controls

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

@@ -5,9 +5,30 @@
         <ResourceDictionary Source="../../Basic/Fonts.xaml"/>
     </ResourceDictionary.MergedDictionaries>
 
+    <Style x:Key="FocusVisual">
+        <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>
+
+    <Style x:Key="FocusVisualRadius0">
+        <Setter Property="Control.Template">
+            <Setter.Value>
+                <ControlTemplate>
+                    <Rectangle Margin="-2" Opacity=".6" SnapsToDevicePixels="true" Stroke="{DynamicResource SecondaryBorderBrush}" StrokeThickness="2" StrokeDashArray="1 1"/>
+                </ControlTemplate>
+            </Setter.Value>
+        </Setter>
+    </Style>
+
     <Style x:Key="BaseStyle" TargetType="Control">
         <Setter Property="Foreground" Value="{DynamicResource PrimaryTextBrush}"/>
         <Setter Property="FontSize" Value="{StaticResource TextFontSize}"/>
+        <Setter Property="FocusVisualStyle" Value="{StaticResource FocusVisual}"/>
     </Style>
 
 </ResourceDictionary>