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Updating Dialog Box

 
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Hi, I have this dialog box in my program, and in this dialog box, there's this dropdown menu for choosing some predefined fonts. What I did was that I set action listener for that menu but it seems that I can not change anything once the dialog box is shown(). please please help. I'm looking for some kind of update method, meaning that I'm looking for this a method that would update my dialog after i change one of it's components.

Thanx
 
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