The following code shows how to create button with dropdown.
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
src='http://code.jquery.com/jquery-git2.js'></script>
<link rel="stylesheet" type="text/css"
href="http://netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css">
<script type='text/javascript'
src="http://netdna.bootstrapcdn.com/bootstrap/3.0.3/js/bootstrap.min.js"></script>
</head><!-- w w w . ja va 2s . c o m-->
<body>
<div class="container">
<div class="row">
<div class="col-sm-3">
<div class="panel panel-default">
<div class="panel-body">
<div class="btn-group">
<button type="button" class="btn btn-default dropdown-toggle"
data-toggle="dropdown">
<span data-bind="label">Select One</span> <span
class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu">
<li><a href="#">Item 1</a></li>
<li><a href="#">Another item</a></li>
<li><a href="#">This is a longer item</a></li>
</ul>
</div>
</div>
</div>
</div>
</div>
</body>
</html>