I've just tried the FlowListView control @DanielL made, which works perfectly for my needs. I just have a small issue, that I might be missing on something to make it work...
I simply want to adjust the group header template. I mostly followed the example found on the GitHub repo, and then added a property set on the GroupHeaderTemplate, which I thought would work since the control is based on the ListView, but it doesn't seem to be taking my changes (I added a red background to see the change and it doesn't show up).
Has someone tried doing a group header template that could point me towards the right direction ?