添加项目文件。

GroupLine.App/ViewModel/SubItem.cs

@@ -0,0 +1,16 @@
+using System.Windows.Controls;
+
+namespace GroupLine.App.ViewModel
+{
+    public class SubItem
+    {
+        public SubItem(string name, UserControl screen = null)
+        {
+            Name = name;
+            Screen = screen;
+        }
+        public string Name { get; private set; }
+        public UserControl Screen { get; private set; }
+
+    }
+}