The following code shows how to create drop down button with anchor and UL.
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-1.8.3.js'></script>
<script type='text/javascript'
src="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/js/bootstrap.min.js"></script>
<link rel="stylesheet" type="text/css"
href="http://netdna.bootstrapcdn.com/twitter-bootstrap/2.3.2/css/bootstrap-combined.min.css">
</head><!--from ww w.j a v a2s .c o m-->
<body style='margin:30px'>
<div class="dropdown btn-group">
<a class="btn dropdown-toggle" data-toggle="dropdown" href="#">
Action <span class="caret"></span>
</a>
<ul class="dropdown-menu">
<li><a href="#">Foo</a></li>
<li><a href="#">Bar</a></li>
</ul>
</div>
</body>
</html>