Combo Box Component

Hello,

I'm running flash v8pro and having problems using the combo box in a movie. When I add a combobox using the combobox component I just get a white box where the combobox should appear. However, if I open up a new .fla and try to use the cb it works. I'm trying to add the combobox to the main timeline in the last frame and it's not working. Is there anything specific I need to look for to solve this problem?

Thanks,
tdsilk