How do add bootstrap 3 validation states to input groups. The state seems to only apply to the input part of the group.
EDIT 10/02/2014: To clarify, I'm using an input group with a button:
<div class="form-group has-success col-md-3">
  <label class="control-label"></label>
  <div class="input-group">
    <input type="text" class="form-control">
    <span class="input-group-btn">
      <button class="btn btn-default" type="button">Go!</button>
    </span>
  </div>
</div>
 
     
     
    