title: can i add a listbox in GWT celltable
body: <p>is it possible to add a listbox inside a GWT CellTable </p>
  
  <p>Have to make some thing like in the attached Image</p>
  
  <p><img src="https://i.stack.imgur.com/cscYw.png" alt="enter image description here"></p>
  
  <p>Thanks </p>