based on your local values, you can simply use the following expression

    ((MS.Internal.Data.CollectionViewGroupInternal)myCollectionViewSource.View.Groups[0]).ItemCount

I have a Collection View source in which I've set two Group Descriptions



	myCollectionViewSource.GroupDescriptions.Add(New PropertyGroupDescription("PrimaryProperty"))
	myCollectionViewSource.GroupDescriptions.Add(New PropertyGroupDescription("SecondaryProperty"))


As Illustrated below, the primary grouping has found 338 records.
Those are broken up into 179 pairs of records based on the secondary GroupDescription.  If I'm evaluating a child grouping element, is there a way for me to get the `ItemCount` of the primary grouping from which it originally comes?

![View of Groups][1]

Please and thank you.

  [1]: http://i.stack.imgur.com/EBWFd.png