/**
* Overrides <code>JComponent.removeNotify</code> to check if this button is currently set as the
* default button on the <code>RootPane</code>, and if so, sets the <code>RootPane</code>'s
* default button to <code>null</code> to ensure the <code>RootPane</code> doesn't hold onto an
* invalid button reference.
*/
public void removeNotify() {
JRootPane root = SwingUtilities.getRootPane(this);
if (root != null && root.getDefaultButton() == this) {
root.setDefaultButton(null);
}
super.removeNotify();
}
