Microsoft.Phone.Controls.ListPicker.OnApplyTemplate C# (CSharp) Method

        public override void OnApplyTemplate()
        {
            // Unhook from old elements
            if (null != _itemsPresenterHostParent)
            {
                _itemsPresenterHostParent.SizeChanged -= OnItemsPresenterHostParentSizeChanged;
            }
            _storyboard.Stop();

            base.OnApplyTemplate();

            // Hook up to new elements
            _itemsPresenterPart = GetTemplateChild(ItemsPresenterPartName) as ItemsPresenter;
            _itemsPresenterTranslateTransformPart = GetTemplateChild(ItemsPresenterTranslateTransformPartName) as TranslateTransform;
            _itemsPresenterHostPart = GetTemplateChild(ItemsPresenterHostPartName) as Canvas;
            _itemsPresenterHostParent = (null != _itemsPresenterHostPart) ? _itemsPresenterHostPart.Parent as FrameworkElement : null;
            _multipleSelectionModeSummary = GetTemplateChild(MultipleSelectionModeSummaryPartName) as TextBlock;
            _border = GetTemplateChild(BorderPartName) as Border;

            if (null != _itemsPresenterHostParent)
            {
                _itemsPresenterHostParent.SizeChanged += OnItemsPresenterHostParentSizeChanged;
            }
            if (null != _itemsPresenterHostPart)
            {
                Storyboard.SetTarget(_heightAnimation, _itemsPresenterHostPart);
                if (!_storyboard.Children.Contains(_heightAnimation))
                {
                    _storyboard.Children.Add(_heightAnimation);
                }
            }
            else
            {
                if (_storyboard.Children.Contains(_heightAnimation))
                {
                    _storyboard.Children.Remove(_heightAnimation);
                }
            }
            if (null != _itemsPresenterTranslateTransformPart)
            {
                Storyboard.SetTarget(_translateAnimation, _itemsPresenterTranslateTransformPart);
                if (!_storyboard.Children.Contains(_translateAnimation))
                {
                    _storyboard.Children.Add(_translateAnimation);
                }
            }
            else
            {
                if (_storyboard.Children.Contains(_translateAnimation))
                {
                    _storyboard.Children.Remove(_translateAnimation);
                }
            }

            SetBinding(ShadowItemTemplateProperty, new Binding("ItemTemplate") { Source = this });


            // Commit deferred SelectedIndex (if any)
            if (-1 != _deferredSelectedIndex)
            {
                SelectedIndex = _deferredSelectedIndex;
                _deferredSelectedIndex = -1;
            }
            if (null != _deferredSelectedItem)
            {
                SelectedItem = _deferredSelectedItem;
                _deferredSelectedItem = null;
            }

            OnSelectionModeChanged(SelectionMode);
            if (this.SelectionMode == System.Windows.Controls.SelectionMode.Single)
            {
                OnSelectedItemChanged(SelectedItem, SelectedItem);
            }
            else
            {
                OnSelectedItemsChanged(SelectedItems, SelectedItems);
            }
        }