How can I add a control to a parent form, in design time, through a custom component?

I have create a custom component which changes some properties of it's parent form when placed in design time. But I also want this component, in design time again, to add some controls to it's parent form. I tried something like this code example below, but with no luck. The added control placed on the form, but I can't select it, just stands there!!! Any idea what exactly am I doing wrong? Thank you in advance!!!

Code:

---

Public Class MyCustomComponent
    Private _MyControl As New MyUserControl
   
    '...Rest of my code
   
    Private Sub OnPlace()
          '...Rest of my code
          _ParentForm.Controls.Add(_MyControl)
    End Sub

    Private Sub OnDispose()
          '...Rest of my code
          _MyControl.Dispose()
    End Sub

End Class

---

Suppose you drag a button onto a Form, and code its Click event to show a message box. In the Designer, you can do all sorts of things to the button, like dragging it around, setting its properties in the Properties window and so on. You can click on it too. But it doesn't perform your event code - it doesn't show a message box. And if you double-click it, Visual Studio will take you to the form's code, something that fortunately doesn't happen at run time.

Suppose you make a UserControl with a button on it, and drag an instance of it onto a form. What you see is not a real user control but a picture of it. You can drag the UC around and change its properties in the Forms Designer. But you can't do these things to the child button (unlike in the UserControl Designer). The Forms Designer doesn't even know that there's a button in the picture.

Creating a Component to insert a button into the host form, for example in the Host.Set property is similar. The Form Designer will paint a picture of the button (the component itself remaining invisible) but apart from that the designer doesn't even know it's there. Yet the button is functional at run time.

To sum up, the design time behaviour is governed by the Designer, and the run time behaviour is governed by your own code. You can of course customize the designer in some respects; I think by now you know more about that than I do.

BB