JComboBox: Background color of button different to the popup

Question

Hello,
I want to have a combo box in wich the background color of the arrow button would be different to the color of popup menu.
I did this, but it didn't take the effect.
setUI(new MetalComboBoxUI(){
            protected javax.swing.JButton createArrowButton() {
                javax.swing.JButton button = new MetalComboBoxButton( comboBox,
                        icon,
                        comboBox.isEditable(),
                        currentValuePane,
                        popupList );
                button.setMargin( new java.awt.Insets( 0, 10, 10, 30 ) );
                button.setBorder(null);
                button.setBackground(Color.green);
                return button;
        });thanks in advance.

Answer 1

Try this:import java.awt.Color;
import java.awt.FlowLayout;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.SwingUtilities;
import javax.swing.UIDefaults;
import javax.swing.UIManager;
import javax.swing.plaf.ColorUIResource;
import javax.swing.plaf.basic.BasicComboBoxUI;
public class ComboWithGreenButton {
   String [] data = {"option0", "option1", "option2", "option3"};
   JComboBox combo;
   void makeUI() {
      combo = new JComboBox(data);
      combo.setUI(new BasicComboBoxUI());
      JFrame frame = new JFrame("Combo with green button");
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setSize(100, 60);
      frame.setLayout(new FlowLayout());
      frame.add(combo);
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            UIDefaults defaults = UIManager.getDefaults();
            defaults.put("ComboBox.buttonBackground",
                  new ColorUIResource(Color.GREEN));
            new ComboWithGreenButton().makeUI();
}luck, db