Bug 161425 [Viewers] TableTreeViewer => EditingSupport broken
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/TableTreeViewer.java
/**
		 * Set the cell modifier
		 * 
		 * @param modifier
		 */
		public void setCellModifier(ICellModifier modifier) {
			this.cellModifier = modifier;
		}
		/**
		 * Set the column properties
		 * 
		 * @param columnProperties
		 */
		public void setColumnProperties(String[] columnProperties) {
			this.columnProperties = columnProperties;
		}
		Rectangle getBounds(Item item, int columnNumber) {
			return ((TableTreeItem) item).getBounds(columnNumber);
		}
		int getColumnCount() {
			
			return getTableTree().getTable().getColumnCount();
		}
		Item[] getSelection() {
			return getTableTree().getSelection();
		}
		void setEditor(Control w, Item item, int columnNumber) {
			tableTreeEditor.setEditor(w, (TableTreeItem) item, columnNumber);
		}
		void setSelection(StructuredSelection selection, boolean b) {