Thank you for contacting us.
The icon you see in the application bar is the default "X" icon for the OS and because of limitations from Silverlight runtime, we are not able to add different images to our assemblies. The screen, where you choose month and year is actually part of Telerik's RadDatePicker control, which is used inside RadCalendar. More information on how to change these icons to your own images or to our sample icons you can find here
I hope this information is useful. Let me know if you need additional assistance.
the Telerik team
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