Bug 153993 [Viewers] Common Baseclass for Tree/TableEditorImpl
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ColumnViewer.java
}
	/**
	 * Activate the tooltip support.
	 */
	public void activateCustomTooltips() {
		if (tooltipSupport == null) {
			tooltipSupport = new ToolTipSupport(this);
		} else {
			tooltipSupport.activate();
		}
	}
	/**
	 * Deactivate the tooltip support.
	 */
	public void deactivateCustomTooltips() {
		if (tooltipSupport != null) {
			tooltipSupport.deactivate();
		}
	}
	/**
	 * Update the cached cell with the row and column.
	 * 
	 * @param rowItem
	 * @param column
	 * @return ViewerCell
	 */
	ViewerCell updateCell(ViewerRow rowItem, int column) {
		cell.update(rowItem, column);
		return cell;
	}