<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button"
id="dropdownMenu1" data-toggle="dropdown"
aria-haspopup="true" aria-expanded="true">
Dropdown
<span class="caret"></span>
</button>
<ul class="dropdown-menu" aria-labelledby="dropdownMenu1">
<li class="dropdown-header">Dropdown header</li>
<li><a href="#">Action</a></li>
<li class="disabled"><a href="#">Disabled link</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"> </li>
<li class="dropdown-header">Dropdown header</li>
<li><a href="#">Separated link</a></li>
</ul>
</div>