support for .NET framework 3.5

Still have bugs

Net35/HandyControlDemo_Net35/UserControl/Styles/MenuDemoCtl.xaml

@@ -0,0 +1,21 @@
+<UserControl x:Class="HandyControlDemo.UserControl.MenuDemoCtl"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:langs="clr-namespace:HandyControlDemo.Properties.Langs"
+             Background="{DynamicResource RegionBrush}">
+    <Grid Margin="32">
+        <TextBlock Text="{x:Static langs:Lang.RightClickHere}" Foreground="{DynamicResource BorderBrush}" Style="{StaticResource TextBlockTitle}"/>
+        <Rectangle Width="200" Height="112" RadiusX="4" RadiusY="4" Stroke="{DynamicResource BorderBrush}" StrokeDashArray="2,2"/>
+        <Border Width="200" Height="112" Background="Transparent">
+            <Border.ContextMenu>
+                <ContextMenu ItemsSource="{Binding DataList}">
+                    <ContextMenu.ItemTemplate>
+                        <HierarchicalDataTemplate ItemsSource="{Binding DataList}">
+                            <TextBlock Text="{Binding Name}"/>
+                        </HierarchicalDataTemplate>
+                    </ContextMenu.ItemTemplate>
+                </ContextMenu>
+            </Border.ContextMenu>
+        </Border>
+    </Grid>
+</UserControl>