you can rewrite your code like this:
objApplication = Browser.SilverlightApps().GetApp(0);
DataGrid objDataGrid = objApplication.Find.ByName<DataGrid>(
A major difference is that CellElements will return IDataGridCell (an Interface) and not a "normal" DataGridCell element. We've implemented this in order to improve code reusability for WPF/Silverlight testing.
One consequence is that you'll need to cast IDataGridCell to a Silverlight DataGridCell (unless you're doing WPF testing in which case you'll have to cast it to a WPF DataGridCell).
That being said I agree that the IDataGridCell interface should contain a Find method (which would have eliminated the need for casting in the above logic). I've logged this as a bug, you can track its progress here:
the Telerik team
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