AddThis

Facebook Share button within a Facebook Tab?

I've been using Add This within all the tabs that I create for Facebook. When the Facebook Add This button is clicked on any of these tabs the business page is being shared and not the tab itself. What I would like happen is for all the specific tab information to be shared along with a image of the tab, url and description, but I'm not sure if this is possible. I've tried using the the title tag (addthis:title) in a few places, but nothing changed. The closest I got to the what I wanted was when I used the Facebook canvas url instead of the business page url along with the app id, but that didn't give the same results.

Thanks for your time.

Here's the link to the tab:
http://www.facebook.com/bluecrossblueshieldofillinois/app_318369294902103

Here is the code I have in one of my Facebook tabs:

<script type="text/javascript">
var addthis_config = {
services_compact: 'facebook, twitter, email, more',
ui_cobrand: "BCBSIL", ui_header_color: "#ffffff",
ui_header_background: "#1a71b7",
ui_use_addressbook: "true",
data_track_linkback: "true",
ui_email_note: 'No pain, no gain? No way! Challenge yourself and reap mental AND physical benefits. Check out BCBSIL&#8217;s Find your Fit tab for tips and weekly challenges!'
}
</script>
<script type="text/javascript" src="http://s7.addthis.com/js/250/addthis_widget.js#pubid=xa-4eb2f72f2f520794"></script>

<!-- AddThis Button END -->
<div class="addthis_toolbox addthis_default_style">
<a class="addthis_button_facebook" addthis:url="http://www.facebook.com/bluecrossblueshieldofillinois/app_318369294902103"></a>
<a class="addthis_button_twitter" addthis:url="http://www.facebook.com/bluecrossblueshieldofillinois"></a>
<a class="addthis_button_email" addthis:url="http://www.facebook.com/bluecrossblueshieldofillinois" href="http://www.addthis.com/bookmark.php"></a>
<a class="addthis_button_compact" addthis:url="http://www.facebook.com/bluecrossblueshieldofillinois" href="http://www.addthis.com/bookmark.php"></a>
</div>
</div>