First I noticed this error when viewing the online demo for 
polymer-ui-dropdown, and I just thought that the demo might be out of date. 
 However I also get get this error when trying to use the element in my 
app.  It occurs when trying to toggle the dropdown.  The only references to 
PolyGroup I can find in all of the Polymer code is in 
"polymer-animation.html" and "polymer-overlay.html", and it's only when 
trying to instantiate the missing class.  There is no definition of it in 
core, elements or ui-elements.

Any help would be appreciated.

Thanks

 - Paul

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