support for .NET framework 3.5

Still have bugs

Net35/HandyControlDemo_Net35/UserControl/Controls/ImageBrowserDemoCtl.xaml

@@ -0,0 +1,12 @@
+<UserControl x:Class="HandyControlDemo.UserControl.ImageBrowserDemoCtl"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             Background="{DynamicResource RegionBrush}"
+             xmlns:langs="clr-namespace:HandyControlDemo.Properties.Langs"
+             DataContext="{Binding ImageBrowserDemo,Source={StaticResource Locator}}"
+             xmlns:controls="clr-namespace:HandyControl.Controls;assembly=HandyControl">
+    <StackPanel Margin="32">
+        <controls:ImageViewer Background="{DynamicResource BackgroundBrush}" Width="600" Height="330" ImageSource="/HandyControlDemo;component/Resources/Img/1.jpg"/>
+        <Button Margin="0,32,0,0" Command="{Binding OpenImgCmd}" Content="{x:Static langs:Lang.OpenImageBrowser}" Style="{StaticResource ButtonPrimary}" HorizontalAlignment="Center"/>
+    </StackPanel>
+</UserControl>