Thank you for writing.
There are two ways to do this, depending of how you start this dialog. If you open the dialog from code you could use the following code snippet:
"your subject write here"
In the other case you should inherit EditAppointmentDialog and set the subject field's text. Please, note that you need to know whether the appointment is new or it is in edit mode in order to write/override the subject. After that you could replace edit appointment dialog as described in the scheduler help
I hope this will help you. Feel free to contact me for further questions.
All the best,
the Telerik team
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