>>>Is there a way at runtime to know if a list box is in the drop down state? Thanks!
>>
>>Set a flag in the DropDown event and reset it in Valid.
>
>If you close the drop popup
>- with ESC
>or
>- mousedown into the popup and mouseup out of the popup,
>
>Valid is not executed.

You can always reset the flag in the GotFocus and LostFocus.