JComboBox and Mac

[Pres Brawner]

Hi All,
My JComboBox behaves as you would expect on an NT platform, but on MAC it goes to pieces.
Imagine a JComboBox where you have three items in the list. The JComboBox is near the top of the JDialog that contains it.
The user selects the last item.
The user selects down arrow to display.
MAC: The JComboBox displays upwards and only shows two items. You can't even scroll to see the top item in the list.
NT: The JComboBox displays downward starting at the top most item and shows the selected item as highlighted.
Can I force the combobox to display downward?
Can I force the combobox to display all entries?
Thanks!