Commented Issue: Allow LongListSelector group headers to remain visible [9734]

Provide a way for the current group header in a LongListSelector to remain visible when the group's content is scrolled, so that it's always clear which group is being displayed. This is analogous to the what is done in the "all" pane of the Contacts app's panorama.
Comments: ** Comment from web user: Frank_Krumnow **

I used to do this by myself (with a simple TextBlock above the list) on the golden old times when I could getItemsInView(). Since then I never got it back to work, as I found no way of a) get an Item that leaves the screen or b) calculate the scrollstate

very frustrating
now a got to cry a little bit