Lets explain my situation:

A user has an appointment, the appointment begin 2:00. When the appointment gets selected, the user needs to see the preferred time of the appointment.

Example:

Appointment:
- StartTime : 2:00
- EndTime: 2:30
- PreferredStartTime: 1:30
- PreferredEndTime: 4:00

When i select this appointment i need to see the preferredtime with some kind of visual "hook". When my celltime was 5 minutes, i just painted the right side of my cellpresenter. Now that the cellpresenters are larger (1 hour), i only want the half of my cellpresenter painted. 

Is that possible, or is it possible to paintsome custom items on the scheduler. I know i can add some custom items, but when i do that the scheduler automatically resizes the width of the appointments.

"If you instead want to visually indicate the preferred time by highlighting the corresponding cells in the Timetable when the item is selected, you can also do this - by using custom CellPresenters for the timetable cells. "

This is the way i want it.

I have it this way, and when the celltime was 5 minutes, i was ok with it. But now that the celltime is 1 hour, i have to paint a part of the cellpresenter. (How) can i do this?

Ok, i will try that! Thanks you! I'll let you know.. (But i think it will take a couple of days before i'll can try..)