>>>I know, but I want a combobox - not enough space for the listbox.
>>
>>There is something like MouseEnter/MouseLeave where you can expand (change the height) the list /set the height back ?
>
>That's an interesting idea. Let me review the class I found and may be I can use auto-expanded ListBox idea if that class would not work for me.

I just tried it - looks sexy - and what is more if you forgot the choice(s) you can mouve the mouse over it