add FocusVisualStyle for some controls

src/Net_GE45/HandyControl_Net_GE45/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"/>