Adding ToolStrips to a container during design-time (via collection editor)

[NickThissen]

By the way, if I use the following code instead, which adds Buttons to a Panel instead of ToolStrips to a ToolStripPanel, then it works just fine!

Public Class ButtonPanel
    Inherits Panel
 
    Private _Buttons As New ButtonCollection(Me)
    Public ReadOnly Property Buttons() As ButtonCollection
        Get
            Return _Buttons
        End Get
    End Property
 
End Class
 
Public Class ButtonCollection
    Inherits System.Collections.ObjectModel.Collection(Of Button)
 
    Private _panel As ButtonPanel
    Public Sub New(ByVal panel As ButtonPanel)
        _panel = panel
    End Sub
 
    Protected Overrides Sub InsertItem(ByVal index As Integer, ByVal item As System.Windows.Forms.Button)
        MyBase.InsertItem(index, item)
        _panel.Controls.Add(item)
    End Sub
 
End Class

Now I can use the Buttons property of this panel to add/remove them via a collection editor window (very similar to how you can add/remove TabPages to a TabControl).

This code is exactly the same as above... The only difference is that I replaced the ToolStripPanel with Panel* and ToolStrip with Button. I can't figure out why this works with buttons but not with ToolStrips.


*The problem is not caused by using a ToolStripPanel instead of a Panel. I cannot add ToolStrips to a normal Panel this way either.