Name of this element

Skip the GroupView then - it may be easier this way:

<ScrollViewer>
   <StackPanel Orientation="Horizontal">
      <!-- group starts here -->
      <StackPanel>
         <TextBlock Text="Group x"/>
         <WrapGrid>
            <!-- put grouped items here.  -->
         </WrapGrid>
      </StackPanel>
      <!-- group ends right above this line -->
     
      <!-- group starts here -->
      <StackPanel>
         <TextBlock Text="Group x"/>
         <WrapGrid>
            <!-- put grouped items here.  -->
         </WrapGrid>
      </StackPanel>
      <!-- group ends right above this line -->

   <StackPanel>
</ScrollViewer>
  

To do: set the modes and styles for each stackpanel and the scrollviewer.

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Darin R.