Microsoft.Phone.Controls.ContextMenu.ClosePopup C# (CSharp) Method

        private void ClosePopup()
        {
            if (null != _backgroundResizeStoryboard)
            {
                // Swap all the From/To values to reverse the animation
                foreach (DoubleAnimation animation in _backgroundResizeStoryboard.Children)
                {
                    double temp = animation.From.Value;
                    animation.From = animation.To;
                    animation.To = temp;
                }

                // Capture member variables for delegate closure
                Popup popup = _popup;
                Panel overlay = _overlay;
                _backgroundResizeStoryboard.Completed += delegate
                {
                    // Clear/close popup and overlay
                    if (null != popup)
                    {
                        popup.IsOpen = false;
                        popup.Child = null;
                    }
                    if (null != overlay)
                    {
                        overlay.Children.Clear();
                    }
                };

                // Begin the reverse animation
                _backgroundResizeStoryboard.Begin();

                // Reset member variables
                _backgroundResizeStoryboard = null;
                _popup = null;
                _overlay = null;
            }
            else
            {
                if (null != _popup)
                {
                    _popup.IsOpen = false;
                    _popup.Child = null;
                    _popup = null;
                }
                if (null != _overlay)
                {
                    _overlay.Children.Clear();
                    _overlay = null;
                }
            }
            SizeChanged -= OnContextMenuOrRootVisualSizeChanged;
            if (null != _rootVisual)
            {
                _rootVisual.SizeChanged -= OnContextMenuOrRootVisualSizeChanged;
            }

            // Remove Click handler for ApplicationBar Buttons
            foreach (ApplicationBarIconButton button in _applicationBarIconButtons)
            {
                button.Click -= OnEventThatClosesContextMenu;
            }
            _applicationBarIconButtons.Clear();

            // Remove BackKeyPress handler from page
            if (_page != null)
            {
                _page.BackKeyPress -= OnPageBackKeyPress;
                ClearValue(ApplicationBarMirrorProperty);
                _page = null;
            }

            // Update IsOpen
            _settingIsOpen = true;
            IsOpen = false;
            _settingIsOpen = false;

            OnClosed(new RoutedEventArgs());
        }
    }