else if ( element instanceof ComputedColumnHandle ) { return ( (ComputedColumnHandle) element ).getExpression( ); }
	public String getTooltipText( Object element )	{		if ( element instanceof Operator )		{			return ( (Operator) element ).tooltip;		}		else if ( element instanceof ILocalizableInfo[] )		{			return ( (ILocalizableInfo[]) element )[1].getToolTip( );		}		return getDisplayText( element );	}