private Component buildHeader() {
		JPanel panel = new JPanel(new BorderLayout());
		panel.setBorder(BorderFactory.createEmptyBorder(10, 0, 0, 0));
		return panel;
	}
Panel for display the Entropy color legend.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/overview/entropy/LegendPanel.java