Microsoft.Silverlight.Testing.Controls.TreeViewItem.OnIsExpandedPropertyChanged C# (CSharp) Method

        private static void OnIsExpandedPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            TreeViewItem source = d as TreeViewItem;
            bool isExpanded = (bool) e.NewValue;

            // Notify any automation peers of the expansion change
            TreeViewItemAutomationPeer peer = FrameworkElementAutomationPeer.FromElement(source) as TreeViewItemAutomationPeer;
            if (peer != null)
            {
                peer.RaiseExpandCollapseAutomationEvent((bool) e.OldValue, isExpanded);
            }

            // Raise the Expanded and Collapsed events
            RoutedEventArgs args = new RoutedEventArgs();
            if (isExpanded)
            {
                source.OnExpanded(args);
            }
            else
            {
                source.OnCollapsed(args);
            }

            if (isExpanded)
            {
                // Try to scroll the child TreeViewItems into view once we've
                // finished expanding them.  We do it immediately if there is
                // no ExpansionStateGroup, or wait for the transition to finish
                // if there is one.
                if (source.ExpansionStateGroup == null && source.UserInitiatedExpansion)
                {
                    source.UserInitiatedExpansion = false;

                    TreeView parent = source.ParentTreeView;
                    if (parent != null)
                    {
                        // Note that we scroll the entire TreeViewItem into
                        // view, not just its HeaderElement.
                        parent.ItemsControlHelper.ScrollIntoView(source);
                    }
                }
            }
            else if (source.ContainsSelection)
            {
                // Select the this item if it collapsed the selected item
                source.Focus();
            }
        }