Bug 153993 [Viewers] Common Baseclass for Tree/TableEditorImpl
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/AbstractTreeViewer.java
int insertionPosition = position;
					if (insertionPosition == -1) {
						insertionPosition = getItemCount(item);
					}
					createTreeItem(item, element, position);
				}
			} else {
				int insertionPosition = position;
				if (insertionPosition == -1) {
					insertionPosition = getItemCount((Control) widget);
				}
				createTreeItem(widget, element, position);
			}
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.ColumnViewer#getColumnViewerOwner(int)
	 */
	protected Widget getColumnViewerOwner(int columnIndex) {
		
		return null;
	}
	
	/* (non-Javadoc)
	 * @see org.eclipse.jface.viewers.ColumnViewer#getCellEditors()
	 */
	public CellEditor[] getCellEditors() {
		return new CellEditor[0];