You seem to have posted a non-redistrubutable part of the SandDock source code, which we sent you in private. We've had to remove your post attachment.
This has to do with the way theme files are written the "example" themes packaged with the demo application are not supported and can be considered not to support every feature of SandDock. It seems the Acrobat one doesn't handle nested DockSites properly. If you find that the standard themes do not support this, let us know.