I have created a test project based on the code you provided, but could not reproduce the problem that you have described. The dock command is visible at all times while running the page. Please see for yourself - I have attached the project to the thread.
In order to help you we will need your assistance. Can you please put together a sample project where this issue can be observed, open a new support ticket and send it back to us? Once we receive it we will do our best to provide a working solution.
the Telerik team