I write a simple form designer in vs2005. I can add and edit controls on
this designer. but when I delete a control, it can not repond.

the code like this:

   public partial class Form1 : Form
   {
       public Form1()
       {
           InitializeComponent();
       }

       private void Form1_Load(object sender, EventArgs e)
       {
           DesignSurface surface = new DesignSurface();
           surface.BeginLoad(typeof(Form));
           Control view = (Control)surface.View;
           view.Dock = DockStyle.Fill;
           this.splitContainer1.Panel1.Controls.Add(view);
           this.propertyGrid1.SelectedObject =
surface.ComponentContainer.Components[0];

           toolBoxService = new DemoToolboxService();

           toolBoxService.ToolBox = new ListBox();

           toolBoxService.ToolBox.Items.Add("Point");
           toolBoxService.ToolBox.Items.Add(new
ToolboxItem(typeof(Button)));
           toolBoxService.ToolBox.Items.Add(new
ToolboxItem(typeof(TextBox)));
           toolBoxService.ToolBox.Items.Add(new
ToolboxItem(typeof(Label)));
           toolBoxService.ToolBox.Items.Add(new
ToolboxItem(typeof(TabControl)));
           toolBoxService.ToolBox.Items.Add(new
ToolboxItem(typeof(StatusBar)));

           toolBoxService.ToolBox.Dock = DockStyle.Fill;
           this.panel1.Controls.Add(toolBoxService.ToolBox);

           menuCommandService = new MenuCommandService(surface);
           IServiceContainer container =
surface.GetService(typeof(IServiceContainer)) as IServiceContainer;

           if (container != null)
           {
               container.AddService(typeof(IToolboxService),
toolBoxService);
               container.AddService(typeof(IMenuCommandService),
menuCommandService);
           }

          selectionService = surface.GetService(typeof(ISelectionService))
as ISelectionService;
           selectionService.SelectionChanged += new
EventHandler(selectionService_SelectionChanged);
       }

       void selectionService_SelectionChanged(object sender, EventArgs e)
       {
           object[] selection;
           if (selectionService.SelectionCount == 0)
               propertyGrid1.SelectedObject = null;
           else
           {
               selection = new object[selectionService.SelectionCount];
               selectionService.GetSelectedComponents().CopyTo(selection,
0);
               propertyGrid1.SelectedObjects = selection;
           }

       }

       private DemoToolboxService toolBoxService;
       private ISelectionService selectionService;
       private MenuCommandService menuCommandService;

       private void deleteToolStripMenuItem_Click(object sender, EventArgs
e)
       {
           menuCommandService.GlobalInvoke(StandardCommands.Delete);
       }
   }

thank!