I tried to reproduce the described problem, using the provided code sample, but without success. I have attached my test project so that you can compare it with your actual one and check if there are differences in the setup. Here
you can find a screen capture of the RadDock's appearance on my end.
Most probably the problem is caused by global CSS styles that affect the default appearance of the RadDock control. I would suggest checking if there are such styles and if the issue persists after removing them.
If you are still experiencing difficulties after examining the information, provided above, please open a support ticket
and try modifying the attached sample so that the problem is reproducible. In case this is not an option, you can also send a simple, fully runnable page
that isolates the described behavior so that I can examine it locally and provide a more to the point answer.
the Telerik team
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