support for .NET framework 3.5

Still have bugs

Net35/HandyControlDemo_Net35/Window/BlurWindow.xaml

@@ -0,0 +1,16 @@
+<controls:BlurWindow x:Class="HandyControlDemo.Window.BlurWindow"
+                     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+                     xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+                     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+                     xmlns:controls="clr-namespace:HandyControl.Controls;assembly=HandyControl"
+                     xmlns:langs="clr-namespace:HandyControlDemo.Properties.Langs"
+                     mc:Ignorable="d"
+                     WindowStartupLocation="CenterScreen"
+                     Title="{x:Static langs:Lang.Title}"
+                     ShowTitle="True"
+                     Style="{StaticResource WindowBlur}"
+                     Height="450" 
+                     Width="800" 
+                     Icon="/HandyControlDemo;component/Resources/Img/icon.ico">
+</controls:BlurWindow>