When the TabContainer is marked visible="false" inside a UpdatePanel and then switched to visible="true", it doesn't render correctly. The styling for the tabs is not shown if switched from invisible to visible in an UpdatePanel.
Comments: This ticket was filed for a pre-15.1 version of AJAX Control Toolkit. If this is still an issue in v15.1 or later, please create a new inquiry.
Comments: This ticket was filed for a pre-15.1 version of AJAX Control Toolkit. If this is still an issue in v15.1 or later, please create a new inquiry.