protected void addApplyButton() {
		applyButton = new JButton("Apply");
		applyButton.setMnemonic('A');
		applyButton.setName("Apply");
		applyButton.getAccessibleContext().setAccessibleName("Apply");
		applyButton.addActionListener(e -> applyCallback());
		addButton(applyButton);
	}
Adds an "Apply" button to the button panel.  The protected method
applyCallback() will be invoked whenever the "Apply" button is pressed.
Ghidra/Framework/Docking/src/main/java/docking/DialogComponentProvider.java