public class MyEditor extends GraphicalEditorWithFlyoutPalette {

        ...

        @Override
	protected PaletteRoot getPaletteRoot() {
		PaletteRoot paletteRoot = ...;

		PaletteGroup group = new PaletteGroup(null);
		controlGroup.add(new ToolEntry("Delete", null, null, null, AAA.class) {});
		paletteRoot.add(controlGroup);

		return paletteRoot;
	}

	public static class AAA extends AbstractTool {

		@Override
		protected String getCommandName() {
			return null;
		}

		@Override
		public void activate() {
			super.activate();
			IAction action = ((ActionRegistry) (((DefaultEditDomain) getDomain()).getEditorPart().getAdapter(ActionRegistry.class))).getAction(ActionFactory.DELETE.getId());
			if (action.isEnabled()) {
				action.run();
			}
			setState(STATE_TERMINAL);
			handleFinished();
		}
	}

        ...
}