Thank you for writing.
You could use the following code snippet:
CustomEditAppointmentDialog customEditAppointmentDialog = new CustomEditAppointmentDialog();
customEditAppointmentDialog.StartPosition = FormStartPosition.CenterScreen;
and then you can set this dialog to the arguments in the AppointmentEditDialogShowing event.
If you have other questions feel free to ask.
All the best,
the Telerik team
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