PB11.2 8669 XP & Vista

I have an input screen with a number of dddw, when the input
sheet reaches the bottom of the screen the behaviour of the
drop downs change so they pop upwards (as expected).
However, if the windows taskbar is larger than the default
height it seems to pop under the taskbar and affectively cut
it in half.

It seems that in order to determine if a dddw should pop up
or down, it must workout if the dddw.height + dddw.Y >
screen height. Rather than dddw.height + dddw.Y > screen
height - taskbar.height.

Is there anyway to change this behaviour so it always pops
up close to the bottom of the screen?

Thanks!