@Override
	public void serviceAdded(Class<?> interfaceClass, Object service) {
		super.serviceAdded(interfaceClass, service);
		if (interfaceClass == FieldMouseHandlerService.class && fieldMouseHandlerService == null) {
			fieldMouseHandlerService = (FieldMouseHandlerService) service;
			fieldMouseHandlerService.addFieldMouseHandler(fieldMouseHandler);
		}
	}
Shows the registers available in a program along with any values that are set.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/register/RegisterPlugin.java