[Boa Constr] TypeError

[alienoid <ali...@is...>]

Hello everyone.
I'm a newbie in boa. I use v0.1.0-alpha under Win 2K and when I try to
put wxMenu to Data View I get:

TypeError: unbound method properties() must be called with
           CollectionDTC instance as first argument(got MenuDTC instance instead)

Can anybody help me to understand what it means.