Accessing expander from Listbox's groupstyle?

Private void eve_PreviewMouseLeftButtonDown_Expander(object sender, MouseButtonEventArgs e) { GroupItem gi = sender as GroupItem; if (gi! = null) { ControlTemplate ct = gi. Template; if (ct!

= null) { DependencyObject content = ct.LoadContent(); Expander expander = content as Expander; if (expander! = null) { //Expand or collapse expander. IsExpanded =!expander.

IsExpanded; } } } }.

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