Controlling buttom width

Controlling buttom width

Does JQM offer any classes that allow a button to span 100% of the width of its container?  Here is the code I'm using, but it does not span the full width like other JQM elements:

<div data-role="controlgroup" data-type="horizontal">
<a data-theme="b" data-role="button" href="/mobile/locations">Contact</a>
<a data-theme="b" data-role="button" href="/mobile/inquire">Inquire</a>
<a data-theme="b" data-role="button" href="/mobile/index.html">Home</a></div>

Other data-role elements like "listview" and "collapsible" span the width of the container.  Any suggestions would be appreciated.

Thanks!