Issue caused by: RadPanelBar, ContentAreaMode="Div" When RadEditor is placed in a contracted RadPanelBar and RadEditor's ContentAreaMode is set to Div, upon the panel's expansion, RadEditor's height shrinks and JavaScript errors are thrown. Occurs in: IE7 and IE8.
The issue cannot be reproduced with the latest version оf Telerik Web UI for ASP.NET AJAX (R2 2016)