I have spent the morning chasing my own tail.
in the prior version I had a group that had site create.
simple change in the mySites dashlet - same logic.
but the dropdown Javascript has me lost.
I see
<item type="js" id="sites">
Alfresco.module.Sites
</item>
in sites.js there is a call to modules/header/sites
this is where it comes from, but where is modules/header/sites ?