title: RSSelectionMenu dismiss popup window
body: <p>I am using <code>RSSelectionMenu</code> as an alert to show a list of dates.</p>
  
  <p>But the window will only dismiss when something is selected.</p>
  
  <p>How can I dismiss the popup with either a Done button or by clicking outside the window.</p>
  
  <p>this is the code I am using for the window from the <code>Github site</code>.</p>
  
  <pre><code>// or specify alert button title
  selectionMenu.show(style: .alert(title: "Select", action: "Done", height: nil), from: self)
  </code></pre>
  
  <p>Thank you very much.</p>