I am afraid that SPRadScheduler does not support this behaviour.
You can try implementing similar behaviour within a custom VisualWebPart with RadCalendar that updates RadScheduler - this online demo
illustrates such scenario.
(Please note that under SharePoint you need to add AjaxSettings programmatically
the Telerik team
Learn how the Telerik controls can be integrated in SharePoint 2007/2010 from this resource
. To watch them in action, explore our online SharePoint 2010