Using Swing's JComboBox...

I am having trouble with the JComboBox from Swing.  I have a combo box on one of my panels.  I have added a few items to the combo box.  When I run the app, and try to select an item from the combo box, the popup list of items does not appear.  Why is this, and how can I fix it?
stepmaAsked:
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fontaineCommented:
Maybe are you using both AWT and Swing components. This is not recommended. If you are adding the JComboBox to a Panel, try using a JPanel instead. If this is not the problem, it is difficult to make a diagnosis without taking a look at the code...
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stepmaAuthor Commented:
I am using a JPanel...Here is the code:

val_sph = new JComboBox(items);
            val_sph.setSelectedIndex(0);
            val_sph.setLightWeightPopupEnabled(false);
            val_sph.setEditable(false);
            add(val_sph);

I have gotten it to work by adding setLightWeightPopupEnabled(false);
Why is this?
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mnelson051997Commented:
Is your JComboBox at the bottom of the panel?  If so, making the
popup heavy will allow it to display outside the panel.  This would
explain why it shows up when you use setLightWeightPopupEnabled(false).
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