/// <summary>
        /// Renders a horizontal rule element.
        /// </summary>
        /// <param name="element"></param>
        /// <param name="blockUIElementCollection"></param>
        /// <param name="context"></param>
        private void RenderHorizontalRule(HorizontalRuleBlock element, UIElementCollection blockUIElementCollection, RenderContext context)
        {
            var rectangle = new Rectangle();
            rectangle.HorizontalAlignment = HorizontalAlignment.Stretch;
            rectangle.Height = HorizontalRuleThickness;
            rectangle.Fill = HorizontalRuleBrush ?? context.Foreground;
            rectangle.Margin = HorizontalRuleMargin;

            blockUIElementCollection.Add(rectangle);
        }
        /// <summary>
        /// Renders a horizontal rule element.
        /// </summary>
        /// <param name="element"></param>
        /// <param name="currentBlocks"></param>
        private void RenderHorizontalRule(HorizontalRuleBlock element, BlockCollection currentBlocks)
        {
            // This is going to be weird. To make this work we need to make a UI element
            // and fill it with text to make it stretch. If we don't fill it with text I can't
            // make it stretch the width of the box, so for now this is an "ok" hack.
            InlineUIContainer contianer = new InlineUIContainer();
            Grid grid = new Grid();
            grid.Height = 2;
            grid.Background = new SolidColorBrush(Color.FromArgb(255, 153, 153, 153));

            // Add the expanding text block.
            TextBlock magicExpandingTextBlock = new TextBlock();
            magicExpandingTextBlock.Foreground = new SolidColorBrush(Color.FromArgb(255, 153, 153, 153));
            magicExpandingTextBlock.Text = "This is Quinn writing magic text. You will never see this. Like a ghost! I love Marilyn Welniak! This needs to be really long! RRRRREEEEEAAAAALLLLYYYYY LLLOOOONNNGGGG. This is Quinn writing magic text. You will never see this. Like a ghost! I love Marilyn Welniak! This needs to be really long! RRRRREEEEEAAAAALLLLYYYYY LLLOOOONNNGGGG";
            grid.Children.Add(magicExpandingTextBlock);

            // Add the grid.
            contianer.Child = grid;

            // Make the new horizontal rule paragraph
            Paragraph horzPara = new Paragraph();
            horzPara.Margin = new Thickness(0, 12, 0, 12);
            horzPara.Inlines.Add(contianer);

            // Add it
            currentBlocks.Add(horzPara);
        }