return getTableEditPart( ) != null ^ getListEditPart( ) != null;
return getTableEditPart( ) != null ^ getListEditPart( ) != null && ( (TableHandle) getTableEditPart( ).getModel( ) ) .canContain( TableHandle.GROUP_SLOT, ReportDesignConstants.GROUP_ELEMENT );
	public boolean isEnabled( )	{		return getTableEditPart( ) != null ^ getListEditPart( ) != null;	}