I will answer your questions point by point:
1) You could achieve that using the GroupFilter
property of the ViewDefinition. Please find attached a sample project which illustrates this feature - it is for WPF, but the logic is the same for Silverlight.
2) I am sorry, but this cannot be achieved with the current implement
3) This feature is in progress and it will be available in the upcoming version of the controls.
4) If you want to completely change the header I can suggest you to hide it using the NavigationHeaderVisibility
="Collapsed" property and add your custom control with commands. The same approach is used in the First Look example of the ScheduleView
Hope this information is helpful.
All the best,
the Telerik team
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