add some demos & styles

1. add window demo
2. add scrollviewer demo
3. add radiobutton style
4. fixed some bugs
5. add research project

HandyControlDemo/Window/CommonWindow.xaml

@@ -0,0 +1,17 @@
+<controls:WindowBorderless x:Class="HandyControlDemo.Window.CommonWindow"
+                           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"
+                           ShowTitle="True"
+                           Background="#f0f0f0"
+                           WindowStartupLocation="CenterScreen"
+                           Style="{StaticResource CustomWindowStyle}"
+                           Title="{x:Static langs:Lang.Title}" 
+                           Height="450" 
+                           Width="800">
+    <Border Background="{StaticResource MainContentBackground}"/>
+</controls:WindowBorderless>