I have a ModalPopupExtender that I am using to popup a panel that contains a TabContainer with some TabPanels. After upgrading to the new toolkit when I click the button to popup the panel with the tabs I am getting a javascript error:
______Unable to get property 'length' of undefined or null reference______
This never happened before. Any idea what could be the cause? Or if there is a fix for this?
Comments: Thank you for your report! This problem was fixed, and the fix is included in the next release coming soon. Please, check [this item](https://ajaxcontroltoolkit.codeplex.com/workitem/27775) for more information.
______Unable to get property 'length' of undefined or null reference______
This never happened before. Any idea what could be the cause? Or if there is a fix for this?
Comments: Thank you for your report! This problem was fixed, and the fix is included in the next release coming soon. Please, check [this item](https://ajaxcontroltoolkit.codeplex.com/workitem/27775) for more information.