I'm comparing the original Office 2007 style with the style applied to Toolbar and there is a minor difference. The expander for toolbar is gray in Telerik controls but blue in Outlook 2007. Please take a look to attached image as a reference.
Unfortunately, we were not able to reproduce the issue you've encountered. Please find attached a sample file. You can compare it with your project. If you still have any problems you can send us your project
All the best,
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?
Telerik Public Issue Tracking
system and vote to affect the priority of the items