Add a InteractiveDialog demo for the DialogExtension.

HandyControlDemo/ViewModel/ViewModelLocator.cs

@@ -5,6 +5,7 @@ using CommonServiceLocator;
 using GalaSoft.MvvmLight.Ioc;
 using HandyControlDemo.Data;
 using HandyControlDemo.Service;
+using HandyControlDemo.ViewModel.Basic;
 
 namespace HandyControlDemo.ViewModel
 {
@@ -30,6 +31,7 @@ namespace HandyControlDemo.ViewModel
             SimpleIoc.Default.Register<DialogDemoViewModel>();
             SimpleIoc.Default.Register<SearchBarDemoViewModel>();
             SimpleIoc.Default.Register<NotifyIconDemoViewModel>();
+            SimpleIoc.Default.Register<InteractiveDialogViewModel>();
         }
 
         public static ViewModelLocator Instance => new Lazy<ViewModelLocator>(() =>
@@ -65,6 +67,7 @@ namespace HandyControlDemo.ViewModel
 
         public NotifyIconDemoViewModel NotifyIconDemo => ServiceLocator.Current.GetInstance<NotifyIconDemoViewModel>();
 
+        public InteractiveDialogViewModel InteractiveDialog => ServiceLocator.Current.GetInstance<InteractiveDialogViewModel>();
         #endregion
     }
 }