RadGrid selection loosing when RadDataPager selction is changed

[Chandu]

Hello All,

I am working on silverlight 4 application.I started working on Telerik controls.Am getting data from WCF Service and binding it to RadGrid and am using RadDataPager to Radgrid to change the pages and to view records page by page.

My problem is i can able to select all records in RadGrid programmatically,but  when i change the page in RadDataPager am loosing my selection.
Please help me regarding this....

Thanks
Chandu