When I include a JCombobox and a JTextField, then I choose some value from the combo box, then i click on the text box the cursor never appears in it until the the whole Java window is minimized and then restored.
Word of wisdom: no-one cares about your urgency (well, at least I don't and the lack of response seems to support this). And no-one can guess what your problem actually is, since you've posted no code. I'm kind of interested in this behviour: post your code!
Heroic work plunger man. Please allow me to introduce you to this tiny ad: