Hello, I'm trying to add a control to the toolbox using a windows forms
application.
All goes well, and no error found, but it does not appear after the
application finishes (even after i restart Visual Studio.NET).

Thanks in advance

Here is the code:

       Dim DevEnv As DTE = New DTEClass()

       'Get the list of toolbox tabs
       Dim win As Window =
DevEnv.Windows.Item(Constants.vsWindowKindToolbox)
       Dim tb As ToolBox = DirectCast(win.Object, ToolBox)
       Dim tbt As ToolBoxTabs = tb.ToolBoxTabs
       Dim MyToolboxTab As ToolBoxTab
       Dim tbtTemp As ToolBoxTab

       For Each tbtTemp In tbt
           If tbtTemp.Name = "MyControls" Then
               MyToolboxTab = tbtTemp
           End If
       Next tbtTemp
       'Adds the "MyControls" tab
       If MyToolboxTab Is Nothing Then
           MyToolboxTab = tbt.Add("MyControls")
       End If
       'Make sure the properties window is visible. This gets around a
VS.Net bug when installing toolbox icons
       DevEnv.ExecuteCommand("View.PropertiesWindow", String.Empty)
       MyToolboxTab.Activate()
       MyToolboxTab.ToolBoxItems.Item(1).Select()
       'Add controls to the "My Controls" tab
       MyToolboxTab.ToolBoxItems.Add("NewButton",
"E:\\Controls\\NewButton\\bin\\NewButton.dll",
vsToolBoxItemFormat.vsToolBoxItemFormatDotNETComponent).Name)
       'I Checked here for MyToolboxTab.ToolBoxItems.Count, and the item is
there.
       DevEnv.Quit()
       DevEnv = Nothing