return "Refers to " + ( (ComputedColumnHandle) element ).getExpression( );
return TOOLTIP_BINDING_PREFIX + ( (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( );		}		else if ( element instanceof ComputedColumnHandle )		{			return "Refers to " + ( (ComputedColumnHandle) element ).getExpression( );		}		return getDisplayText( element );	}