In order to achieve your goal, you can use the ParentOfType<T> extension method like so:
private void playersGrid_AddingNewDataItem(object sender, Telerik.Windows.Controls.GridView.GridViewAddingNewEventArgs e)
var parentRow = (sender as RadGridView).ParentOfType<
You can check this blog post
explaining how to work with the ChildrenOfType<T>() and ParentOfType<T>() extension methods.
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