How to add JCombobox to panels and Paness to frames

we added different items to combobox and that combobox to panels that panels is added to Jame, then we added listener to this combobox , then if we click on this combobox the list of items is appering in the back of the screen . How can i solve this probles ??.

JComboBox box = new JComboBox();
Container cont = getContentPane();
box.addItem("option1");
box.addItem("option2");
box.addItem("option3");
box.addItem("option4");
box.addItem("option5");
cont.add(box);
setContentPane(cont);
I hope that answers your question.
Dunk

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