EDIT

	    if(PreferencesUtil.getBooleanValue(IPreferenceKeys.SHOW_EXPERIMENTAL_FEATURES)){

	        // add textual type designation button

	        Action addTextualTypeDesignationAction = new Action("Add", IAction.AS_PUSH_BUTTON){

	            @Override

	            public void run() {

	                TextualTypeDesignation textualTypeDesignation = TextualTypeDesignation.NewInstance();

	                addElement(textualTypeDesignation);

	                if(! getSection().isExpanded()) {

	                    getSection().setExpanded(true);

	                }

	                internalUpdateSection(true);

	        };

	        addTextualTypeDesignationAction.setImageDescriptor(new ImageDescriptor() {

	            @Override

	            public ImageData getImageData() {

	                return ImageResources.getImage(ImageResources.ADD_TEXT).getImageData();

	            }

	        });

	        addTextualTypeDesignationAction.setToolTipText("Add textual type designation");

	        toolBarManager.add(addTextualTypeDesignationAction);

	    }