Bug 161425 [Viewers] TableTreeViewer => EditingSupport broken
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableTreeViewer.java
*/
	public Object[] getColumnProperties() {
		return tableEditorImpl.getColumnProperties();
	}
	/*
	 * (non-Javadoc) Method declared on Viewer.
	 */
	public Control getControl() {
		return tableTree;
	}
	/**
	 * Returns the element with the given index from this viewer. Returns
	 * <code>null</code> if the index is out of range.
	 * <p>
	 * This method is internal to the framework.
	 * </p>
	 * 
	 * @param index
	 *            the zero-based index
	 * @return the element at the given index, or <code>null</code> if the
	 *         index is out of range
	 */
	public Object getElementAt(int index) {
		
		
		TableTreeItem i = tableTree.getItems()[index];
		if (i != null) {
			return i.getData();
		}
		return null;