Completion display per cell

is there a way to display a completion bar per cell (not per item or in the footer area)? As I did not find a build in solution, I tried to use an additional item that contains nothing but a completion bar to represent the completion status for the cell. Problem here: the item's height is too large. So my questions are:

1. Is there a built in way to display a completion bar per cell?
2. How can I define a single item's height?
3. Is there any other solution to display something like a cell header, where general information about the cell can be displayed?

Thanks for your help.

Sorry, completion can only be displayed in an item. The height of an item is equal to the row height * nr. of timeslots the item takes.

If you want to display something independent from a PlannerItem, you could do this via custom drawing from the event Planner.OnPlannerBkgDraw