title: Unable to set Binding to a Run that resides in a TextBlock
body: <pre><code>&lt;Window
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      DataContext="This is my text"&gt;
    &lt;TextBlock&gt;
      &lt;Run Text="{Binding}"/&gt;
    &lt;/TextBlock&gt;
  &lt;/Window&gt;
  </code></pre>
  
  <p>Throws <code>InvalidOperationException</code>: "Two-way binding requires Path or XPath."</p>
  
  <p>Specifying <code>Mode=OneWay</code>, leads to a weird compiler error:</p>
  
  <p><code>The tag 'Binding,' does not exist in XML namespace 'http://schemas.microsoft.com/winfx/2006/xaml/presentation'.</code></p>
  
  <p>Is there any xamly way to fix this?</p>