thanks for the replies,
found this one too that sounds interesting:
Data storage objects in a container
It's possible to add data storage objects like Array and Dictionary to a container with another object. Despite the fact these objects are invisible, a separate instance of the object is still created for each container. This allows you to have a dedicated Array or Dictionary for each instance of an object. This can be very useful as an advanced substitute for instance variables, such as if a very large number of variables is necessary, or if variables need to be dynamically added and removed.
scirra. com /manual/150/containers