private void defineInternalFrameIconifyButtons(UIDefaults d) {
String p = "InternalFrame:InternalFrameTitlePane:\"InternalFrameTitlePane.iconifyButton\"";
String c = PAINTER_PREFIX + "TitlePaneIconifyButtonPainter";
d.put(p + ".States", "Enabled,MouseOver,Pressed,Disabled,Focused,Selected,WindowNotFocused,WindowMinimized");
d.put(p + ".WindowNotFocused", new TitlePaneIconifyButtonWindowNotFocusedState());
d.put(p + ".WindowMinimized", new TitlePaneIconifyButtonWindowMinimizedState());
d.put(p + ".contentMargins", new InsetsUIResource(0, 0, 0, 0));
// Set the iconify button states.
d.put(p + "[Enabled].backgroundPainter", new LazyPainter(c, TitlePaneIconifyButtonPainter.Which.BACKGROUND_ENABLED));