Header navigation buttons set enabled false?

[Dorin]

I need to set those 3 buttons ( navigate left , navigate right and the middle one who opens up a datetimepicker) Enabled = False in some scenarios. I did succed for the left and right navigation buttons by searching through their parents untill i reach the RadScheduleView type (using GetVisualParent<RadScheduleView>()). I dont know why this is not happening for the middle button too. Please help.
Thank you !

Edit : Please let me know if there is a short way to do that instead of my approach.

[Dorin]

Well, I guess we'll never know ... "Thanks"