I have a problem where the All day area is missing in the scheduleview when I'm using Group Descriptions. I took your WithDb example and added ShowAllDayArea = "True" to the DayViewDefinition. If I run it with the GroupDescriptionSource, I don't see the AllDay area. If I comment out the GroupDescriptionSource, it shows up. Is this by design? I'd really like to be able to group and have an all day slot. I've attached pictures of what it looks like with the GroupDescriptionSource and without.