title: iOS picker appears behind the sheet
body: <p>O<a href="https://i.stack.imgur.com/Ah25j.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ah25j.png" alt="enter image description here" /></a>n iOS devices and the simulator if a picker is selected from a sheet window the picker option appears behind the sheet.</p>
  <pre><code>Sheet sheet = new Sheet(null, &quot;My Sheet&quot;);
  sheet.setLayout(new BoxLayout(BoxLayout.Y_AXIS));
  
  Picker p_fromDate = new Picker();
  p_fromDate.setType(PICKER_TYPE_DATE);
  
  sheet.add(p_fromDate);
  
  sheet.show();
  </code></pre>
  <p>I have also added this to github issues <a href="https://github.com/codenameone/CodenameOne/issues/3588" rel="nofollow noreferrer">https://github.com/codenameone/CodenameOne/issues/3588</a></p>
  <p>Is there a simple work around in the mean time? The virtual keyboard is not affected in this way by I'd prefer to keep the picker if possible.</p>