To achieve the desired behavior, you can attach to the RadGridView's Loaded event and in it with the extension method ChildrenOfType of the grid to find all Paths with name equal to PART_SortIndicator. Then you only need to change the Fill property with the brushes which you want. For your convenience I prepared a code snippet:
sender, RoutedEventArgs e)
var sortIndicators =
.clubsGrid.ChildrenOfType<Path>().Where(x => x.Name ==
sortIndicator.Fill = Brushes.White;
Another approach would be to find this Path element in the default template and change its Fill property there.
I hope that this helps.
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