private static void OnChangedUseExtender(DependencyObject sender, DependencyPropertyChangedEventArgs e)
{
TreeViewItem item = sender as TreeViewItem;
if (null != item)
{
if ((bool)e.NewValue)
{
if (item.ReadLocalValue(ItemExtenderProperty) == DependencyProperty.UnsetValue)
{
TVIExtender extender = new TVIExtender(item);
item.SetValue(ItemExtenderProperty, extender);
}
}
else
{
if (item.ReadLocalValue(ItemExtenderProperty) != DependencyProperty.UnsetValue)
{
TVIExtender extender = (TVIExtender)item.ReadLocalValue(ItemExtenderProperty);
extender.Detach();
item.SetValue(ItemExtenderProperty, DependencyProperty.UnsetValue);
}
}
}
}
