I haven't looked at the example, but it sounds like you might want to give them something like a physics behaviour, set it as inactive on start, and then use an event to set it as active.
Here's a quick example of what I mean:
drop-boxes.capx
The boxes have physics disabled as an initial state and an instance variable called 'touched' which is 0. When you click on a box it changes their variable 'touched' to 1. Event 2 makes physics active when touched=1
The result is that when you click on a box it drops to the floor.
You could use one event (when object is touched, set physics to enabled) but the reason I used an instance variable is so that you can change the trigger from clicking on them to a collision, or time, or anything you want.
Hmm, maybe I should have looked at the example, but I hope this is a hint in the right direction anyway.