title: TextBox only in uppercase
body: <p>I want the <code>TextBox</code> only be in uppercase. in windows phone it doesn't has <code>CharacterCasing</code>, only solution I can think of is:</p>
  
  <pre><code>private void textBox_TextChanged(object sender, TextChangedEventArgs e)
  {
     textBox.Text = textBox.Text.ToUpper();
  }
  </code></pre>
  
  <p>It will do the process each time user presses a key which is not good. Is there a better way?</p>