Hi Michael Holten,
Thank you for writing.
Richard is right that the up/down arrows can be themed. In Visual Style Builder you need to navigate to:
1.In the Controls Structure:
(either one Up or Down)
2.Then in the Elements you need to go to:
And set the ForeColor property to the desired color.
You can look at the attached screenshot to get a better idea of the solution.
I hope this will be of use to you. If you have further questions, I would be glad to assist you.
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.