I posted this to ms.p.d.framework.windowsforms.controls but the only
response was from somebody who had the same problem.

Can anybody here give me any guidance - or suggest a more appropriate
group?

I am building a small control with two panels and a splitter.

When I use the control in designing an app at design time I want to be
able to add this control to my form and then drag other controls on to
it to be contained within the panels.

Although I can drag controls on to it they do not get 'captured' by it.

I added a couple of properties so that the contained controls can be
specified but I would rather go the drag and drop route.

Any pointers or examples that you are aware of?

Many thanks.