A two way binding to selected item is not applying the "Selected" (in this case "Pressed") template to the timeline item.
Surely expected behaviour would be the same as that of a Gridview or Listview, that is, setting the SelectedItem/s in the view model should result in the same appearance as if the user had actually clicked the timeline item with the SelectionMode set to single?
Surely expected behaviour would be the same as that of a Gridview or Listview, that is, setting the SelectedItem/s in the view model should result in the same appearance as if the user had actually clicked the timeline item with the SelectionMode set to single?