The color of the current time pointer can be changed via the Visual Style Builder. Here you can find more information about using Visual Style Builder. I have attached a screen shot which shows how you can change that color.
I hope this helps. Should you have any further questions, do not hesitate to ask.
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.