In your documenation for the RadEditor on the following pages, there is a typo. Each page contains the text "heigh", but is supposed to be "height".
http://www.telerik.com/help/aspnet-ajax/editor-resizing-dropdown-header-and-popup-size.html
http://www.telerik.com/help/aspnet-ajax/editor-auto-resize-height-expanding-editor-height.html
http://www.telerik.com/help/aspnet-ajax/editor-resizing-dropdown-header-and-popup-size.html
http://www.telerik.com/help/aspnet-ajax/editor-auto-resize-height-expanding-editor-height.html