You can try to perform the exact same logic in the Loaded event of the property grid:
private void myPropertyGrid_Loaded(object sender, System.Windows.RoutedEventArgs e)
var button = this.myPropertyGrid.ChildrenOfType<
>().Where(b => b.Name == "groupButton").FirstOrDefault();
button.IsChecked = true;
I am sending you the updated project so that you may test the functionality.
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