click on node to view the next level nodes in RadMap

[Chalam]

Hi,

i am using RadMap in my silverlight project, i have data like country-states-districts,i want to display countrys when map loaded.
after that when i click on some country node the map should be display states with respect clicked country, and click on state map should display districts.please help me and if you have any sample project please attach that

Thanks in Advance