Multeple Docs in a Doc

I've got the following problem..
In my application I've got a number ActiveX document templates and a script document template.
I would like to create a PROJECT document, which contains 1 ActiveX Document and one Script Document.
The project-document must act like 1 document...
The project-document has got a child frame with a splitter bar. The idea is this, I would like to have 2 other docs for these panes. An ActiveX Document and a script document..
Can anybody please give me some advice in doing this....

Thank you very much in advance,

Rick Blommers