I presume you are thinking on Windows Explorer-like inteface, aren't you?

>David,
>
>>That should be handled by the app help file and end user training.
>
>Let's modify the use case to say: "to provide the benefits of a docked environment and be able to lock or unlock the configuration programmatically once docked"
>
>Another option on the dockable property would support this:
>0 - Docking not supported
>1 - Participates in docking, but not dockable
>2 - Participates in docking, and is dockable
>3 - Lock current docking status && new option
>
>Then, switching programmatically between 3 and 4, we could control positioning and layout of forms, but lock the layout (and optionally give certain users the ability to undock).
>
>After all, we now have anchors to dynamically reposition items on a resize, but we don't also give the user the ability to drag the controls all over the page to break the anchored configurations.