SearchBar command support

HandyControlDemo/HandyControlDemo.csproj

@@ -359,6 +359,7 @@
     <Compile Include="ViewModel\Common\ComboBoxDemoViewModel.cs" />
     <Compile Include="ViewModel\Controls\CoverViewModel.cs" />
     <Compile Include="ViewModel\Controls\DialogDemoViewModel.cs" />
+    <Compile Include="ViewModel\Controls\SearchBarDemoViewModel.cs" />
     <Compile Include="ViewModel\DemoViewModelBase!1.cs" />
     <Compile Include="ViewModel\Main\ContributorsViewModel.cs" />
     <Compile Include="ViewModel\Controls\GrowlDemoViewModel.cs" />