Hi Gregory,
Thank you for your update
In our implementation of the CardView control, we don't have a direct property to group the CardViewItems in XAML. But we have modify our last updated sample by creating a workaround that tries to meet your requirement. In this sample, we have implemented the attached property called "GroupHeader" which is used to group the cardview items according to its values and you can give multiple GroupHeader by seperating the values by comma.
Kindly download the sample from the below link:
Sample:
CardViewSample_ModifiedPlease try our sample and let us know if this helps you,
Regards,
Vijayalakshmi V.R.