k" onclick="unglowBlock()" />
      <input type="button" value="Stack glow last clicked block" onclick="glowStack()" />
      <input type="button" value="Stack unglow last clicked block" onclick="unglowStack()" />
    </p>

    <p>
      <input type="button" value="Undo" onclick="workspace.undo()" />
      <input type="button" value="Redo" onclick="workspace.undo(true)" />
    </p>
  </body>
</html>
