Customize automatic scrollbars in MdiClient among others

Question

Hi
Going deep into customizing controls, automatic scrollbars seems to be the most difficult one.
In the MdiClient of a Mdi-form, scrollbars come forward when a MdiChild is moved outside the client frame.
Looking with the Spy tool these scrollbars does not even seem to be a window of it's own, but the appearance of scrollbars are just drawn and behavior is imitated.
Is there a way at all to customize the look of these?
The only way I see now is to throw out the mdi stuff completely and build your own framework for handling multiple windows.
Thanks.