WPF Zoom WebBrowser внутри панели - предотвращение переполнения

Question

Моя проблема заключается в том, что когда я использую ScaleTransform для элемента управления WebBrowser, он переполняет свой контейнер StackPanel, даже если у меня ClipToBounds = "True". Я пытаюсь добавить возможность увеличения в WebBrowser, но хотел бы, чтобы вертикальные и горизонтальные полосы прокрутки активировались в StackPanel, когда WebBrowser перерастает видимое пространство. Пока все работает нормально в моем коде, но я не могу понять, как предотвратить масштабирование WebBrowser от его родительского элемента. Спасибо за любую помощь!

Xaml

    <Window 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" x:Class="WpfApplication1.MainWindow"
Title="Dialog" Loaded="Window_Loaded" WindowStartupLocation="CenterScreen" Height="775" Width="1043" >

<Grid Height="623" Width="572">
    <Border ClipToBounds="True" >
        <Grid>
            <DockPanel  Background="#FFE8E8E8" Height="28" LastChildFill="False" VerticalAlignment="Top">
                <Button Name="btnZoomOut" MouseUp="Image_MouseLeftButtonUp_1" Click="Image_MouseLeftButtonUp_1">Zoom Out</Button>
                <Button Name="btnZoomIn" MouseUp="Image_MouseLeftButtonUp" Click="Image_MouseLeftButtonUp">Zoom In</Button>
            </DockPanel>

            <Grid ClipToBounds="True" Margin="0,28,0,0">
                <ScrollViewer VerticalScrollBarVisibility="Auto" CanContentScroll="False">
                    <StackPanel Name="Container" Orientation="Vertical" Background="Silver"  ClipToBounds="True">
                        <WebBrowser x:Name="webBrowser1"   Margin="0,10,0,10" Source="http://msdn.com"  />
                    </StackPanel>
                </ScrollViewer>
            </Grid>
        </Grid>
    </Border>
</Grid>

C #:

    using System;
using System.Reflection;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Navigation;

namespace WpfApplication1
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {        
        public MainWindow()
        {
            InitializeComponent();
        }


        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            webBrowser1.Margin = new System.Windows.Thickness(0, 10, 0, 0);
            webBrowser1.LoadCompleted += WebBrowser1_LoadCompleted;
            //webBrowser1.NavigateToString(text); 

            ScaleWebBrowser(webBrowser1);
        }

        private void SetZoom(WebBrowser wb)
        {

            var wbv = (dynamic)wb.GetType().GetField("_axIWebBrowser2",
                              BindingFlags.Instance | BindingFlags.NonPublic)
                              .GetValue(wb);

            int zoomFActor = (int)(scalefactor * 100);

            // Between 10 and 1000
            wbv.ExecWB(63, 2, zoomFActor, ref zoomFActor);
        }

        private void WebBrowser1_LoadCompleted(object sender, NavigationEventArgs e)
        {
            WebBrowser wb = sender as WebBrowser;     

            //Try to Size WebBrowser to loaded document
            mshtml.IHTMLDocument2 docs2 = (mshtml.IHTMLDocument2)wb.Document;
            mshtml.IHTMLDocument3 docs3 = (mshtml.IHTMLDocument3)wb.Document;
            mshtml.IHTMLElement2 body2 = (mshtml.IHTMLElement2)docs2.body;
            mshtml.IHTMLElement2 root2 = (mshtml.IHTMLElement2)docs3.documentElement;

            int width = Math.Max(body2.scrollWidth, root2.scrollWidth);
            int height = Math.Max(root2.scrollHeight, body2.scrollHeight);

            //Resize the control to the exact size to display the page.Also, make sure scroll bars are disabled
            wb.Width = width;
            wb.Height = height;

            //Set an initial zoom
            SetZoom(wb);
        }        

        double scalefactor = 0.5;


        private void ScaleWebBrowser(WebBrowser wb)
        {
            if (scalefactor >= 2)
                scalefactor = 2;

            if (scalefactor <= 0.05)
                scalefactor = 0.05;

           wb.LayoutTransform = new ScaleTransform(scalefactor, scalefactor);      
        }

        private double DecWebBrowser()
        {

            return 0.0;
        }

        private void IncContent()
        {


        }

        private void DecContent()
        {

        }


        private void Image_MouseLeftButtonUp_1(object sender, RoutedEventArgs e)
        {
            scalefactor -= 0.05;
            ScaleWebBrowser(webBrowser1);
            SetZoom(webBrowser1);
        }

        private void Image_MouseLeftButtonUp(object sender, RoutedEventArgs e)
        {
            scalefactor += 0.05;
            ScaleWebBrowser(webBrowser1);
            SetZoom(webBrowser1);
        }
    }

}