Hello Cristi Beres,
Thank you for writing.
After upgrading the theme should look fine. I did not see you mentioning Q1 2010 SP2 though. However, it is important that you update not just to Q1 2010, but to its SP2. The new theme in this version looks like the attached screenshot. In case you have already updated your Telerik version to Q1 2010 SP2, please list the assemblies related to Telerik controls for Windows Forms that appear in your GAC as well as their version numbers. I have a hunch there might be multiple versions in your GAC and your project is referencing the wrong theme.
I am looking forward to your reply.
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items.