Actually that seems to be misleading for the customers in our documentation. The complex types you refer to are not yet implemented in OpenAccess ORM, but they are on our future TODO list. We will change the terminology used in our documentation in the topics that "complex-types" are being mentioned.
the Telerik team
Q1’11 SP1 of Telerik OpenAccess is available for download
; also available is the Q2'11 Roadmap
for Telerik OpenAccess ORM.