MFC redirecting message handlers

To tell the truth at TreeCtrl I mean CSizingControlBarG
http://www.datamekanix.com/
This is a container which can move across the screen. I put my CtreeCtrl on it.

Firstly employer want me to create some invisible CDialog where I should create my CSizingControlBarG with TreeCtrl. After I should dock CSizingControlBarG to FrameWnd. And we are expected to put all handlers to CDialog.

But now I understand that I cannot dock CSizingControlBarG to FrameWnd and I decide to create CSizingControlBarG in FrameWnd. Here I found this problem with redirecting message handlers.

What do you think about it?

Richard, sorry that I didn't explain all the CDialog details.
The reason thanks to which I try to put handlers into CDialog is that HANDLERS has been already writen.

I'am a beginner programmer sturded at the first year of university(MEPHI UNIVERSITY in Russia). I have read a lot about programming course it is realy interesting for me. I've even took part in many programmer contests befor. And now my university teacher proposed me to add some funcional in finished program whish wroted in the company where he works. After that test, I think, he will invited me to company.

So, I'd like to say, that program has olready finished. In program there is a CDialog on FrameWnd where placed TreeCtrl. Teacher want me make this TreeCtrl floating. He advise me to find some implementation of the moving control (link above) and attach it to the project.

In order not to remodel this TreeCtrl's handler I'd like to create my CSizingControlBarG in FrameWnd. And divert the flow of messages to CDialog.

Does not depend on the outcome, I really appreciate your help, Richard.