title: GXT 2.3 : Combobox : tooltip on hover
body: <p>I'm using GWT 2.3.0 and Sencha EXT 2.3.1. I can not upgrade due to software requirements.</p>
  
  <p>I've got a combobox, in a form, with some values.
  A few of these values cannont be entirely displayer because the width of the combobox is too short. But I'm not allowed to enlarge this field.</p>
  
  <p>Is there a solution to add a tooltip, or show the entire value when you are hovering the value in the list ?
  Or make the displayed list larger than the display field ?</p>
  
  <p>Thx,
  Q.</p>