title: Robot Framework dialog pop-up issue
body: <p>I am using the <code>Get value from user</code> command in the Robot Framework with the <em>Selenium2Library</em> to get an input from the user.</p>
  
  <p>Then, when the pop-up for entering the message appears, it appears in the back end of the browser and the user may not be aware that any pop-up has come up:</p>
  
  <pre><code>Get value from user    Enter CAPCHA to proceed !!    none    none
  </code></pre>
  
  <p>How can I make the pop-up dialog to appear above the browser?</p>