title: C# shortcut key underscore not displayed in built application
body: <p>I have a small problem with .Net 4.0 ToolStripMenuItem caption.<br>
  I want it to underscore the Shortcut (access) key letter in the item text.<br>
  I used the ampersand sign in the item text field: '&amp;New map', and it looks fine in the editor:<br>
  <img src="https://i.stack.imgur.com/3fe4J.png" alt="enter image description here"></p>
  
  <p>But, when I build the application, the underscores disappear:<br>
  <img src="https://i.stack.imgur.com/8Y4ok.png" alt="enter image description here"></p>
  
  <p>Does anyone know why does it happen and how to make the underscored display in the built form? </p>