SDKBOX facebook user_likes permission

How do I get user_likes permission from facebook while login?

I have tried this:

  std::vector<std::string> permissions;
  permissions.push_back("user_likes");
  sdkbox::PluginFacebook::login(permissions);

The facebook login dialog doesn’t show the “likes” permissions being requested. Also, sdkbox::PluginFacebook::getPermissionList() doesn’t return the user_likes permission in the list.

Is there anything I am missing here?