Found it!  I guess it helped to post the message.    I guess I answered myself… should I be concerend?  🙂

it is an attribute on the XamDataGrid element:  

GroupByAreaLocation

 

 

="None"

I am trying to do this in the XAML.  I am using MVVM.   I will look at the windows init events.  If I have missed something as to the setup of the xml in XAML, please let me know.