I am a bit confused here! In such a scenario the approaches are different, based on your custom needs.
If you just need to select a row on button click you may use the following snippet of code:
private void Button_Click(object sender, RoutedEventArgs e)
var senderElement = e.OriginalSource as FrameworkElement;
var row = senderElement.ParentOfType<
if (row != null)
row.IsSelected = true;
However I am not quite sure how it corresponds in your custom scenario, you may read more about this here.
Furthermore I believe that the most interesting part in your case is how to delete a row only from the child grids. The following forum thread will give you the information you need, please follow this link.
All the best,
the Telerik team
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