void (ChangeEvent e) { final int value = slider.getValue(); float alpha = value / 100f; final Window wnd = SwingUtilities.getWindowAncestor(slider); if (wnd != null) { final WindowManagerEx mgr = WindowManagerEx.getInstanceEx(); if (value == 100) { mgr.setAlphaModeEnabled(wnd, false); } else { mgr.setAlphaModeEnabled(wnd, true); mgr.setAlphaModeRatio(wnd, 1f - alpha); } } }