JCombobox's popup list is not painted completely

Question

I have a JInternalFrame in a JDesktop, and I also have a JComboBox in the internal frame. The problem is shown below.

How can I make JComboBox paint outside JInternalFrame, so that the popup list can be shown completely? Is using glass pane an optimal solution, or would it be bad practice?

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SOLUTION: I have found the solution; just override the getSize() method of JComboBox:

class MyComboBox extends JComboBox{

    public Dimension getSize(){
        return new Dimension(..);
    } 
}

Answer 1

I'd try calling setLightWeightPopupEnabled(false) on the JCombobox before attempting anything with the glass pane.