title: x:FieldModifier is not valid for the language C#?
body: <p>When I apply x:FieldModifier to my WPF control, eg:</p>
  
  <pre><code>&lt;TextBox x:Name="textBox1" x:FieldModifier="Public"/&gt;
  </code></pre>
  
  <p>visual studio (tried on 2008 and 2010) gives me the following error:</p>
  
  <blockquote>
    <p>x:FieldModifier is not valid for the
    language C#</p>
  </blockquote>
  
  <p>How can I solve this problem?</p>
  
  <p><strong>Edit: Sorry, I want to make it public...</strong></p>