Load test on Drag and Drop

Hi,

I am using  drag and drop functionality  as  shown in the link below between radscheduler and a radgrid to create appointments.
On dropping the record, It  gathers information related to dropped record and send the request to  webservice.
 Response received from webservice is processed  and displayed in a Confirmation RadWindow.
This RadWindow  has a label control display message received from webservice  and two buttons("Ok"/"Cancel")
User clicks  on "Cancel" or "OK" to create/cancel an appointment.

http://demos.telerik.com/aspnet-ajax/scheduler/examples/draganddropintegration/defaultcs.aspx?product=scheduler

 My webtest runs fine by creating new appointment on clicking "Ok" button, but when I use the same webtest for load test, it does
not create any appointments. Can someone  help me in solving this issue?

Thanks,
Prava