添加项目文件。

gong-wpf-dragdrop/src/Showcase/Views/ListBoxSamples.xaml.cs

@@ -0,0 +1,15 @@
+using System.Windows.Controls;
+
+namespace Showcase.WPF.DragDrop.Views
+{
+    /// <summary>
+    /// Interaction logic for ListBoxSample.xaml
+    /// </summary>
+    public partial class ListBoxSamples : UserControl
+    {
+        public ListBoxSamples()
+        {
+            InitializeComponent();
+        }
+    }
+}