@Override
	protected void init() {
		registerMgrProvider = new RegisterManagerProvider(tool, getName());
		tool.addComponentProvider(registerMgrProvider, false);
		createActions();
		fieldMouseHandlerService = tool.getService(FieldMouseHandlerService.class);
		fieldMouseHandler = new RegisterTransitionFieldMouseHandler();
		if (fieldMouseHandlerService != null) {
			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