We are very glad that you are considering using our products! I am not quite sure what you need specific help with as your question is quite general but here you can find more information on how to add a custom command to RadDock Prometheus:Online DemoHelp Article
You can access the controls inside the dock both on the server and on the client. If you need more help, we kindly ask you to provide some more specific information on the exact problem that you face with the control and even send us a simple running
page demonstrating the issue so we can run it and offer a solution. To be able to attach files you need to open a support ticket as demonstrated in the attached instructions. Let us know if you need further assistance.
the Telerik team