I am using Telerik RadControls for ASP.NET Ajax version 2009.3.1103.20. When I mouse over an appointment in the RadScheduler, I get a Microsoft JScript runtime error: 'null' is null or not an object in the _onAppointmentMouseOver function. The problem is that the second call to getAppointmentFromDomElement (italiczed below) returns null ( 'j' is null ). It seems like a bug that we are making two calls to getAppointmentFromDomElement(). Is this a known problem? Is there a fix available?