Bug 214648 [Markers] AttributeMarkerGroupings and GroupingEntries not being cleaned up on removal
We are still leaving the references to AttributeMarkerGroupings and GroupingEntries when we unload
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerGroup.java
*/
		public Image getColumnHeaderImage() {
			return null;
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.ui.views.markers.internal.IField#getColumnHeaderText()
		 */
		public String getColumnHeaderText() {
			return markerGroup.getTitle();
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.ui.views.markers.internal.IField#getDefaultDirection()
		 */
		public int getDefaultDirection() {
			return TableComparator.ASCENDING;
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.ui.views.markers.internal.IField#getDescription()
		 */
		public String getDescription() {
			return markerGroup.getTitle();
		}
		/*
		 * (non-Javadoc)