Can be done with pure Bootstrap code.
<link href="//cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.2/css/bootstrap.css" rel="stylesheet"/>_x000D_
_x000D_
<div class="form-group">_x000D_
<label for="id" class="col-md-2 control-label">ID</label>_x000D_
<div class="input-group">_x000D_
<span class="input-group-btn">_x000D_
<select class="form-control" name="id" id="id">_x000D_
<option value="">_x000D_
</select>_x000D_
</span>_x000D_
<span class="input-group-btn">_x000D_
<select class="form-control" name="nr" id="nr">_x000D_
<option value="">_x000D_
</select>_x000D_
</span>_x000D_
</div> _x000D_
</div>
_x000D_