Click Image To enlarge
Select HTML JAVASCRIPT to add the page element .
Now You have to add some html codes to his page element to show of the scroll bar menu widget to the sidebar of your blogger.
<div class="widget-content">
<ul style="height:150px;width:150px; overflow:auto; ">
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li>
<li><a href="http://www.blogaddress.com">Your Text</a></li><span style="font-weight:bold;"></span>
</ul></div>
Copy this codes and paste it to page element and save it.
Now preview your blog.
You can change your links and text in the codes to show of yours links and posts.
Note:-In the codes you can edit height and width in red to adjust it to your blog.