ComboBox DropDown lists vanish as soon as you move the mouse to make a selection. Compiling with Flex 3 compatability set on. This did not happen in Beta 1. Is this a bug or is there a new property that needs to be set? The only work-around that I know of is to make sure the comboBox has the focus, place the mouse just below it (where the drop list will show) and press ctrl-Down Arrow. Then the mouse is useable.