Bug 213139 [Markers] Forms in problems filtering configuration dialog doesn't grab vertical space
type list in marker filtering configuration dialog doesn't grab vertical space
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/TypesConfigurationArea.java
*/
		public abstract void addElementsMatching(Collection selectedTypes,
				Collection entries);
		/**
		 * Return the children of the receiver.
		 * 
		 * @return TypesEntry[]
		 */
		public abstract Collection getChildren();
		/**
		 * Return the label for the receiver.
		 * 
		 * @return String
		 */
		public abstract String getLabel();
		/**
		 * Return the parent of the receiver.
		 * 
		 * @return TypesEntry
		 */
		public abstract TypesEntry getParent();
		/**
		 * Return whether or not the receiver has children.
		 * 
		 * @return boolean
		 */
		public abstract boolean hasChildren();
	}
	private static Collection EMPTY_COLLECTION = new HashSet();
	private HashMap models = new HashMap(0);