Bug 126839 [DataBinding] IObservable refactoring
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/internal/databinding/viewers/TreeViewerUpdatableTree.java
* @return an Object, the parent of this Node
		 */
		public Object getParent() {
			return parent;
		}
		/**
		 * @param children
		 */
		public void setChildren(List children) {
			this.children = children;
			requestedChildren=false;
		}
		/**
		 * @return true if VIRTUAL request has been made already
		 */
		public boolean isRequestedChildren() {
			return requestedChildren;
		}
		/**
		 * @param requestedChildren
		 */
		public void setRequestedChildren(boolean requestedChildren) {
			this.requestedChildren = requestedChildren;
		}
	}
	
	/**
	 * @param viewer
	 */
	public TreeViewerUpdatableTree(final TreeViewer viewer) {