System.Windows.MetroGridHelper.BuildGrid C# (CSharp) Method

        private static void BuildGrid()
        {
            _squares = new List<Rectangle>();

            var frame = Application.Current.RootVisual as Frame;
            if (frame == null || VisualTreeHelper.GetChildrenCount(frame) == 0)
            {
                Deployment.Current.Dispatcher.BeginInvoke(BuildGrid);
                return;
            }

            var child = VisualTreeHelper.GetChild(frame, 0);
            var childAsBorder = child as Border;
            var childAsGrid = child as Grid;
            if (childAsBorder != null)
            {
                // Not a pretty way to control the root visual, but I did not
                // want to implement using a popup.
                var content = childAsBorder.Child;
                if (content == null)
                {
                    Deployment.Current.Dispatcher.BeginInvoke(BuildGrid);
                    return;
                }
                childAsBorder.Child = null;
                Deployment.Current.Dispatcher.BeginInvoke(() =>
                {
                    Grid newGrid = new Grid();
                    childAsBorder.Child = newGrid;
                    newGrid.Children.Add(content);
                    PrepareGrid(frame, newGrid);
                });
            }
            else if (childAsGrid != null)
            {
                PrepareGrid(frame, childAsGrid);
            }
            else
            {
                Debug.WriteLine("Dear developer:");
                Debug.WriteLine("Unfortunately the design overlay feature requires that the root frame visual");
                Debug.WriteLine("be a Border or a Grid. So the overlay grid just isn't going to happen.");
            }
        }