Thank you for writing.
Before addressing your question, I would like to kindly ask you to provide us with the requested information in threads: Radscheduler problem with Grouping Concept
and RadButtonElement needs items.
Once you provide this information, feel free to reply to this thread in order to get your answer.
Thank you for the understanding.
All the best,
the Telerik team
Q1’11 SP1 of RadControls for WinForms is available for download
; also available is the Q2'11 Roadmap
for Telerik Windows Forms controls.