title: How do I create a non-editable GXT ComboBox?
body: <p>I'm using GWT/GXT and trying to create a "normal" ComboBox - one that you cannot type in, but you can type a single character and it will automatically go to the first item in the list that starts with that letter. So, I don't want it READONLY, I want it so that you cannot replace the text in it with your own text (can't type characters into it).</p>
  
  <p>I cannot figure out how to get ComboBox or SimpleComboBox to do this. I've tried every combination of settings on it to no avail. I did see there is a GXT ListBox, but i need a component that extends from Field.</p>
  
  <p>Is there really no way to do this or am I missing something?</p>