SearchBar command support

HandyControlDemo/ViewModel/ViewModelLocator.cs

@@ -25,6 +25,7 @@ namespace HandyControlDemo.ViewModel
             SimpleIoc.Default.Register<ChatBoxViewModel>();
             SimpleIoc.Default.Register<CoverViewModel>();
             SimpleIoc.Default.Register<DialogDemoViewModel>();
+            SimpleIoc.Default.Register<SearchBarDemoViewModel>();
         }
 
         public static ViewModelLocator Instance => new Lazy<ViewModelLocator>(() =>
@@ -54,6 +55,8 @@ namespace HandyControlDemo.ViewModel
 
         public DialogDemoViewModel DialogDemo => ServiceLocator.Current.GetInstance<DialogDemoViewModel>();
 
+        public SearchBarDemoViewModel SearchBarDemo => ServiceLocator.Current.GetInstance<SearchBarDemoViewModel>();
+
         #endregion
     }
 }