How to remove border in JComboBox

Hi i got a JComboBox with a border I need to remove.
I tried:
JConboBox combo = new JComboBox();

combo .setBorder(BorderFactory.createEmptyBorder());

and

combo .setBorder(null);
But that didn't work. Any idea?
I want to remove exactly the border around the JConboBox.

If the appearance of the arrow button isn't an issue, the one-liner to achieve this is

Code:

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comboBox.setUI(new BasicComboBoxUI());

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db

Yes, it works! Thanks a lot!