You have 2 options:
1) You can change the dialog implementing the IScheduleViewDialogHost. More information about that you could find in this help article
2) You could edit the style of the dialog and set it to the ScheduleView through the EditAppointmentDialogStyle
property. You can get the whole xaml of the ScheduleView from the installation folder of the Telerik components on your machine. Usually this is
C://Program Files/Telerik/RadControls for WPF Q1 2012/Themes/ . Inside this folder, search the Themes
folder to find the ScheduleView.xaml
file that corresponds to your theme of choice. From it you could get the style of the EditAppointmentDialog and the necessary brushes and templates. Then you will be able to customize it completely to fit your requirements.
Hope this information helps.
the Telerik team
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