Hi Helmut,
My apologies for the delayed response.
You can add a label, such that it sits over top of the current information, and then format this label anyway you want. Please try the attached sample that shows a try at this.
Here is a sample
http://www.syncfusion.com/Support/user/uploads/GGC_AutoSize1_9e21367a.zipThanks for your patience.
Regards,
Rajagopal