使用MVVM在WPF中显示HTML

有人可以帮我完成这段代码吗？

HTMLView.xaml

<Window x:Class="MyProject.HTMLView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:wf="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms"
    Title="HTML View" Height="454" Width="787"
    >
  <Grid Name="grid1">
    <WindowsFormsHost>

    <wf:RichTextBox x:Name="reportHTML" Text="{Binding DisplayHTML,Mode=OneWay}"/>

       <!-- How do i bind dispaly HTML page here-->

    </WindowsFormsHost>
  </Grid>
</Window>

HTMLViewModel.cs

namespace MyProject
  {
    public class HTMLViewModel: ViewModelBase
    {
      public HTMLViewModel()
      {
            //Reading from SQL Server table 
            //SELECT HTMLReport FROM Report WHERE ID=123
            //OK,I have HTMLString from database over here
            //Now I am assigning that to DisplayHTML Property

           DisplayHTML ="<table><tr><td><b>This text should be in table with bold fond </b></td></tr></table>";
      }

      private string _displayHTML;
      public string DisplayHTML
      {
        get
        {
            return _displayHTML;
        }

        set
        {
            if (_displayHTML!= value)
            {
                _displayHTML= value;
                OnPropertyChanged("DisplayHTML");
            }
        }
    }
  }