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/ViewModel/ViewModelLocator.cs

@@ -2,6 +2,7 @@
 using System.Windows;
 using CommonServiceLocator;
 using GalaSoft.MvvmLight.Ioc;
+using HandyControlDemo.Service;
 
 namespace HandyControlDemo.ViewModel
 {
@@ -11,10 +12,13 @@ namespace HandyControlDemo.ViewModel
         {
             ServiceLocator.SetLocatorProvider(() => SimpleIoc.Default);
 
+            SimpleIoc.Default.Register<DataService>();
+
             SimpleIoc.Default.Register<MainViewModel>();
             SimpleIoc.Default.Register<GrowlDemoViewModel>();
             SimpleIoc.Default.Register<ImageBrowserDemoViewModel>();
             SimpleIoc.Default.Register<ComboBoxDemoViewModel>();
+            SimpleIoc.Default.Register<WindowDemoViewModel>();
         }
 
         public static ViewModelLocator Instance => new Lazy<ViewModelLocator>(() =>
@@ -30,6 +34,8 @@ namespace HandyControlDemo.ViewModel
 
         public ComboBoxDemoViewModel ComboBoxDemo => ServiceLocator.Current.GetInstance<ComboBoxDemoViewModel>();
 
+        public WindowDemoViewModel WindowDemo => ServiceLocator.Current.GetInstance<WindowDemoViewModel>();
+
         #endregion
     }
 }