Paul,

> But especially what Florian said about there being 1 item to few set
> me on a track. Is there also a horizontal scrollbar? I had this
> problem half a year ago: the drop down list was too narrow for the
> data, so a horizontal scrollbar was automatically added. This reduces
> the vertical space by roughly 1 item.

Setting the DropDownWidth to a high enough value actually solves the
problem, it must have been the one property I have not played with.
However, it is peculiar that the described effect only occurs the very first
time the combo is dropped down, after that until the application is closed
everthing works just fine.

Florian