title: Cannot Bind FlowDocument to RichTextBox in WPF
body: <p>Here is my Xaml for RichTextBox </p>
  
  <pre><code>  &lt;RichTextBox HorizontalAlignment="Left" Height="115" Margin="359,194,0,0" VerticalAlignment="Top"    Width="306" x:Name="missingVariablesRichTextBox" &gt;
          &lt;FlowDocument&gt;
              &lt;Paragraph&gt;
                 &lt;ItemsControl  ItemsSource="{Binding}"/&gt;
              &lt;/Paragraph&gt;
          &lt;/FlowDocument&gt;
      &lt;/RichTextBox&gt;
  </code></pre>
  
  <p>Here is my FlowDocument from CodeBehind. Note message builder is a stringbuilder variable that
  has some string contents in it.</p>
  
  <pre><code>FlowDocument missingVariablesDoc = new FlowDocument();
  missingVariablesDoc.Blocks.Add(new Paragraph(new Run(messageBuilder.ToString())));
  missingVariablesRichTextBox.VerticalScrollBarVisibility=ScrollBarVisibility.Auto;
  missingVariablesRichTextBox.DataContext=missingVariablesDoc;
  </code></pre>
  
  <p>When i run the app. I can't see anything in the richtextbox. What am i missing in the XAML 
  databinding?</p>
  
  <p>Any suggestions? </p>