i'm looking for a way to disable/hide the selection border of the items inside of a multiselection-block as statet in the
attached screenshot of Microsoft Excel. My idea was to check, if the item of the collection is FirstItem, LastItem, InnerItem or SingleItem and
handle the BorderThickness based on this item. But how do I check the items block by block, since every multiselection block must be handled separately?
Many thanks in advance!