Bug 215004 [Markers] New Problems view: 'Group by > Type' broken
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerGroup.java
MarkerType type = model.getType(markerType);
		if (type != null) {
			types.add(type);
			MarkerType[] subs = type.getAllSubTypes();
			for (int j = 0; j < subs.length; j++) {
				types.add(subs[j]);
			}
		}
		if (types.isEmpty()) {
			return new MarkerType[0];
		}
		MarkerType[] typesArray = new MarkerType[types.size()];
		types.toArray(typesArray);
		return typesArray;
	}
	/**
	 * Return the title for the receiver.
	 * 
	 * @return String
	 */
	public String getTitle() {
		return configurationElement.getAttribute(MarkerSupportRegistry.LABEL);
	}
	/**
	 * Add an attributeMapping for the markerType.
	 * 
	 * @param attributeGrouping
	 * @param entry
	 * @param attributeValue
	 */