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Should be Vtiger.Class, not jQuery.Class?
http://code.vtiger.com/vtiger/vtigercrm/blob/master/layouts/v7/modules/Vtiger/resources/Popup.js#L9
http://code.vtiger.com/vtiger/vtigercrm/blob/master/layouts/v7/modules/Vtiger/resources/RelatedList.js#L10