namespace System.Windows.Controls
{
    [StyleTypedProperty(Property = "ItemContainerStyle", StyleTargetType = typeof(TreeViewItem))]
    [TemplatePart(Name = "ItemsHost", Type = typeof(ItemsPresenter))]
    [TemplatePart(Name = "PART_Header", Type = typeof(FrameworkElement))]
    public class TreeViewItem : HeaderedItemsControl, IHierarchicalVirtualizationAndScrollInfo
    {
        [Category("Behavior")]
        public event RoutedEventHandler Collapsed;
    }
}