Optimized performance

HandyControlDemo/Window/NoNonClientAreaDragableWindow.xaml

@@ -14,11 +14,11 @@
                      Title="NoClientDragableWindow" 
                      Height="450" 
                      Width="800">
-    <Grid>
+    <controls:SimplePanel>
         <Rectangle VerticalAlignment="Top" Margin="10" Height="30" RadiusX="4" RadiusY="4" Stroke="{DynamicResource BorderBrush}" StrokeDashArray="2,2"/>
         <Border controls:WindowAttach.IsDragElement="True" VerticalAlignment="Top" Margin="11" Height="28" Background="{DynamicResource DarkDefaultBrush}" CornerRadius="4">
             <TextBlock Text="{x:Static langs:Lang.DragHere}" Style="{StaticResource TextBlockDefault}"/>
         </Border>
         <Button Click="ButtonClose_OnClick" HorizontalAlignment="Right" Margin="0,15,15,0" VerticalAlignment="Top" Padding="0" Height="20" Width="20" Style="{StaticResource ButtonPrimary}" controls:IconElement.Geometry="{StaticResource CloseGeometry}" controls:BorderElement.CornerRadius="15"/>
-    </Grid>
+    </controls:SimplePanel>
 </controls:BlurWindow>