I feel that I need to explain a bit more about the specifics of creating a dock dynamically and provide some more details about the example I sent you before. In my example when you click Add Dock a dock is created in button click and this process is ajaxified. So far I believe this is what you are trying to achieve. This dock is created and a custom command is created whose handler executes fine. And here comes the important part - you need to recreate this dock in Page Init otherwise you won't have the dock on your page after a postback occurs. For the proper work of RadDock thsi recreation should take place in Init, not in PageLoad.
Please, take this information into consideration, and if you continue to experience problems, just send us a simple running
page demonstrating what you try to achieve and we will work on it.
the Telerik team