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copied!<ul> <li><p>not able to ...., every have got the same Borders, there must be another issue, 1st and 2nd. are editable JComboBoxes</p></li> <li><p>for better help sooner post an SSCCE, short, runnable, compilable, just about two JComboBoxes, Native OS, compiled in JDK, runned in JRE</p></li> </ul> <p>WinXP Java6</p> <p><img src="https://i.stack.imgur.com/hTobh.jpg" alt="enter image description here"></p> <p>Win7 Java7</p> <p><img src="https://i.stack.imgur.com/qgSre.jpg" alt="> will be edited"></p> <p>Win7 Java6</p> <p><img src="https://i.stack.imgur.com/se3AH.jpg" alt="> will be edited"></p> <p>Win8 Java6</p> <p><img src="https://i.stack.imgur.com/Xjhk7.jpg" alt="enter image description here"></p> <p>Win8 Java7</p> <p><img src="https://i.stack.imgur.com/KulDZ.jpg" alt="> will be edited"></p> <p>from code</p> <pre><code>import java.awt.*; import java.util.Vector; import javax.swing.*; import javax.swing.UIManager; import javax.swing.plaf.ColorUIResource; import javax.swing.plaf.metal.MetalComboBoxButton; public class MyComboBox { private Vector<String> listSomeString = new Vector<String>(); private JComboBox someComboBox = new JComboBox(listSomeString); private JComboBox editableComboBox = new JComboBox(listSomeString); private JComboBox non_EditableComboBox = new JComboBox(listSomeString); private JFrame frame; public MyComboBox() { listSomeString.add("-"); listSomeString.add("Snowboarding"); listSomeString.add("Rowing"); listSomeString.add("Knitting"); listSomeString.add("Speed reading"); // someComboBox.setPrototypeDisplayValue("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"); someComboBox.setFont(new Font("Serif", Font.BOLD, 16)); someComboBox.setEditable(true); someComboBox.getEditor().getEditorComponent().setBackground(Color.YELLOW); ((JTextField) someComboBox.getEditor().getEditorComponent()).setBackground(Color.YELLOW); // editableComboBox.setPrototypeDisplayValue("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"); editableComboBox.setFont(new Font("Serif", Font.BOLD, 16)); editableComboBox.setEditable(true); JTextField text = ((JTextField) editableComboBox.getEditor().getEditorComponent()); text.setBackground(Color.YELLOW); JComboBox coloredArrowsCombo = editableComboBox; Component[] comp = coloredArrowsCombo.getComponents(); for (int i = 0; i < comp.length; i++) { if (comp[i] instanceof MetalComboBoxButton) { MetalComboBoxButton coloredArrowsButton = (MetalComboBoxButton) comp[i]; coloredArrowsButton.setBackground(null); break; } } // non_EditableComboBox.setPrototypeDisplayValue("xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"); non_EditableComboBox.setFont(new Font("Serif", Font.BOLD, 16)); // frame = new JFrame(); frame.setLayout(new GridLayout(0, 1, 10, 10)); frame.add(someComboBox); frame.add(editableComboBox); frame.add(non_EditableComboBox); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLocation(100, 100); frame.pack(); frame.setVisible(true); } public static void main(String[] args) { UIManager.put("ComboBox.background", new ColorUIResource(Color.yellow)); UIManager.put("JTextField.background", new ColorUIResource(Color.yellow)); UIManager.put("ComboBox.selectionBackground", new ColorUIResource(Color.magenta)); UIManager.put("ComboBox.selectionForeground", new ColorUIResource(Color.blue)); SwingUtilities.invokeLater(new Runnable() { @Override public void run() { MyComboBox aCTF = new MyComboBox(); } }); } } </code></pre>

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