Thank you for contacting us.
The code you have provided is from the ControlTemplate of the EditAppointmentDialog. The Text property is bound to the Body of the Appointment and the IsReadOnly property is bound to the IsEnabled property of all the fields in the dialog. For more details about the Custom Dialogs you can check this article
from our documentation. However I'm not sure if we understand correctly your question, could you please give us more details on the scenario you want to achieve so we can help you further?
I'm looking forward to hearing from you.
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