Thank you for writing.
Themes and colors are different things. Themes are complex property settings to all our controls and when you apply one of the predefined themes, the entire application gets the look and feel defined in the theme. This is why you can not select a color in the color dialog and expect it to be applied to the application.
However, there is a possibility, where you set a certain theme and you can change its base color using the ColorBlending mechanism. Please refer to this help article
, which demonstrates how can you use this mechanism.
I hope that this will work for you. Should you have any other questions, do not hesitate to contact us.
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.