Bug 161425 [Viewers] TableTreeViewer => EditingSupport broken
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableTreeViewer.java
cellEditor = null;
				oldEditor.deactivate();
			}
		}
		/**
		 * Start editing the given element.
		 * 
		 * @param element
		 * @param column
		 */
		public void editElement(Object element, int column) {
			if (cellEditor != null) {
				applyEditorValue();
			}
			setSelection(new StructuredSelection(element), true);
			Item[] selection = getSelection();
			if (selection.length != 1) {
				return;
			}
			tableItem = selection[0];
			
			showSelection();
			columnNumber = column;
			activateCellEditor();
		}
		/**
		 * Return the array of CellEditors used in the viewer
		 * 
		 * @return the cell editors
		 */