I use a JComboBox to select the fields I add this JComboBox in a GridBagLayout,but it does not pop down. i hv chk it carefully,the JComboBox is ok.It response for my keybord action. How can I do with this problem.Should I read more information about layer??
That's a weird issue. In my code I have a new JComboBox that I add to the container/contentPane and that's all, and it worked fine. Anything else you might think could cause it. What does your GUI code look like when adding the ComboBox. What are your GridBagContraints set too? Mark