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>