RadGridView is a virtualized control. That being said, it is not recommended to work with its visual elements and change their values or collapse them. Please run through our online documentation
for a reference.
In your exact scenario, my recommendation would be to remove the item directly from the source of the grid. In that way
no row will be created for it and you will not see it displayed.
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Feedback Portal
and vote to affect the priority of the items