How to disable JSplitPane arrow button

How do I disable(grey-out) the arrow button on the JSplitPane. I do know how to get the button from BasicSplitPaneDivider like this:

final int UP_ARROW = 0;
final BasicSplitPaneUI ui = (BasicSplitPaneUI) splitPane.getUI();
final BasicSplitPaneDivider divider = ui.getDi开发者_开发百科vider();
final JButton upArrowButton = (JButton) divider.getComponent(UP_ARROW);

, but when I try upArrowButton.setEnabled(false), it doesn't grey-out the up arrow, but does disable it. I want the user to have a visual feedback that the up arrow button is disabled. I did try upArrowButton.getAction().setEnabled(false), but it doesn't work(NullPointerException).

Please help

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Have you tried setOneTouchExpandable(false)?

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final int UP_ARROW = 0;
final BasicSplitPaneUI ui = (BasicSplitPaneUI) splitPane.getUI();
final BasicSplitPaneDivider divider = ui.getDivider();
final JButton upArrowButton = (JButton) divider.getComponent(UP_ARROW);

upArrowButton.setVisible(false);

This work for me