Bug 215004 [Markers] New Problems view: 'Group by > Type' broken
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerGroup.java
* Create a new instance of the receiver called name with id identifier.
	 * 
	 * @param element
	 */
	protected MarkerGroup(IConfigurationElement element) {
		configurationElement = element;
		if (element != null) 
			id = element.getAttribute(MarkerSupportConstants.ATTRIBUTE_ID);
		createFields();
		processEntries();
	}
	/**
	 * Process the markerContentEntries for the reciever.
	 */
	private void processEntries() {
		
		if(configurationElement == null)
			return;
		
		IConfigurationElement[] markerEntryElements = configurationElement
				.getChildren(MarkerSupportRegistry.MARKER_GROUPING_ENTRY);
		IConfigurationElement[] attributeGroupingElements = configurationElement
				.getChildren(MarkerSupportRegistry.MARKER_ATTRIBUTE_GROUPING);
		Map idsToEntries = new HashMap();
		for (int i = 0; i < markerEntryElements.length; i++) {
			MarkerGroupingEntry entry = new MarkerGroupingEntry(
					markerEntryElements[i]);
			entry.setGroup(this);
			idsToEntries.put(entry.getId(), entry);
		}