System.Windows.Controls.ItemsControlHelper.OnApplyTemplate C# (CSharp) Method

        internal void OnApplyTemplate()
        {
            // Clear the cached ItemsHost, ScrollHost
            _itemsHost = null;
            _scrollHost = null;
        }

 /// <summary>
 /// Builds the visual tree for the
 /// <see cref="T:System.Windows.Controls.TreeView" /> control when a new
 /// control template is applied.
 /// </summary>
 public override void OnApplyTemplate()
 {
     ItemsControlHelper.OnApplyTemplate();
     Interaction.OnApplyTemplateBase();
     base.OnApplyTemplate();
 }