@Override
		public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) {
			g.setColor(selectedMenuBacgroundColor);
			g.fillRect(x, y, width, height);
		}
Background painter for selected menu items.
Ghidra/Framework/Gui/src/main/java/generic/theme/laf/MacLookAndFeelManager.java