The Buttons from the NavigationHeader are placed inside the default Template of RadScheduleView. So, in order to subscribe to their Click events you need to extract that default Template. We could also suggest you to consider using the EventToCommandBehavior
in order to bind the events to a commands inside the ViewModel.
We have created a sample project that demonstrates how to handle the MouseDown event of the DatePicker from the NavigationHeader. Could you please, check it and let us know if it worked for you?
Hope this helps.
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