support for .NET framework 3.5

Still have bugs

Net35/HandyControlDemo_Net35/UserControl/Main/QQGroupView.xaml

@@ -0,0 +1,12 @@
+<UserControl x:Class="HandyControlDemo.UserControl.QQGroupView"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             Background="{DynamicResource SecondaryRegionBrush}">
+    <Border Background="{DynamicResource QqDrawingBrush}">
+        <Border Height="274" Effect="{StaticResource EffectShadow5}" Width="200" CornerRadius="10">
+            <Border.Background>
+                <ImageBrush ImageSource="/HandyControlDemo;component/Resources/Img/qq-group.jpg"/>
+            </Border.Background>
+        </Border>
+    </Border>
+</UserControl>