This would be the expected behavior since RadGridView is virtualized and only the visible visual elements are created. You can refer to our online documentation for a reference.
The recommended approach is always to work with at data level in such cases (you can use Items collection of RadGridView).
the Telerik team
Sharpen your .NET Ninja skills
! Attend Q1 webinar week and get a chance to win a license! Book your seat now >>