Document Map being truncated - why?

I've noticed that the document map for my Microsoft report contains enough entries to fill the height of the document map pane and no more. The document map pane is capable of displaying a vertical scroll bar so I'm not sure what is happening or why. I've played around with the obvious report properties such asInteractiveHeight.

Two questions:

1. Has anyone else had this problem?

2. Can I do anything to restore the missing groups to the document map?

Thanks.

BCB

It was my fault. It turns out that the vertical scroll bar that I expected was concealed beneath a second vertical scroll bar that was hiding the "real" vertical scroll bar. The bogus vertical scroll bar was caused by me setting the document map too narrow. Once I widened the document map the bogus scroll bar disappeared and - presto - the "real" vertical scroll bar was visible.

It probably sounds as clear as mud but check your document map width if you encounter this.