@Override
		public void paintIcon(Component c, Graphics g, int x, int y) {
			g.setColor(Colors.FOREGROUND);
			g.fillRect(x, y + 5, 2, 2);
			g.fillRect(x + 4, y + 5, 2, 2);
			g.fillRect(x + 8, y + 5, 2, 2);
		}
A button meant to be used to show a chooser dialog.
Ghidra/Framework/Docking/src/main/java/docking/widgets/button/BrowseButton.java