You can edit the style of the EditAppointmentDialog using Blend Preview for Silverlight 5, but first you need to generate the whole template of the ScheduleView and then choose Object->Edit Additional Styles
If that doesn't work for you, you could always get the whole xaml of the ScheduleView control from the installation folder of the Telerik components on you machine. Usually this is
C://Program Files/Telerik/RadControls for Silverlight 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.
Also, you could refer to this online demo
where is illustrated how to edit the style of the dialog. You could
copy it from there, but it will be for the Metro theme.
Hope this information helps.
All the best,
the Telerik team
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