Changing the background color of a selected JToggleButton

You might see if setIcon() is sufficient for your purpose, but you can also override paint() in the ButtonUI delegate.

Addendum: @kleopatra's comment is well-taken: changing the UI delegate is not trivial. @mKorbel's recent example shows both the difficulty and versatility of the approach. Its essential advantage is look & feel independence.

Some less ambitious approaches are mentioned here.

"ToggleButton.selected" is wrong, it require "ToggleButton.select". And should be update to the component.

UIManager.put("ToggleButton.select", Color.WHITE);
SwingUtilities.updateComponentTreeUI(togglebuttonname);

JToggleButton btn = new JToggleButton(...);
btn.setUI(new MetalToggleButtonUI() {
    @Override
    protected Color getSelectColor() {
        return Color.RED;
    }
});

When it using "Windows look and feel"; in Netbeans you have to do only two things.

1. Go to properties
2. Un-select 'contentAreaFilled'
3. Select 'opaque'
4. You can set a background color in properties or by hard coding

In other way,

    jToggleButton.setContentAreaFilled(false);
    jToggleButton.setOpaque(true);
    jToggleButton.setBackground(Color.red); //Your color here

That's all.:-)