Thank you for the report.
I managed to reproduce the issue. It will be resolved in the next major release. Meanwhile, I can only give you a workaround that can be invoked on a specific user action, for example on a button click. I can not give you an appropriate event that can automatically update the RulerTimeScale. The following code snippet will update the rulers' properties according to the view properties.
Your Telerik points are updated for the feedback.
Thank you Richard for the community efforts.
the Telerik team
Q3’10 SP1 of RadControls for WinForms is available for download
; also available is the Q1'11 Roadmap
for Telerik Windows Forms controls.