Why can't I see my scroll bars?

I have positioned a nested form on the applications main form along with another control and a TSplitter, as stated in my previous question. If you look at that question, the part labelled "design forms here" needs scrollbars.

No matter whether I set scroll bars programatically to be visible or use the AutoScroll property - I never see the scroll bars !! Grrrr!! I was wondering if something else that I am doing could be removing the scroll bars. For instance BorderStyle := bsNone;

It's not that - when I comment it out I still don't see scrollbars, but that has got me thinking .... a开发者_如何学编程ny ideas?

Is there a reason to use a nested Form on the right side? I tried it with a TScrollBox instead (alclient) and the scrollbars appear as expected...