Surprising little issue

[Scott Kane]

Eric kindly helped me with the issue of storing a list object in a custom 
property and it works beautifully (this is a stack with multiple cards with 
objects set a background groups).  I've been trying to do something similar 
with checkboxes.  However I don't seem to be able to get it to stick. 
Anyone care to share a simple routine to store the checked status of a 
checkbox as a custom property so that each car can have a boolen result that 
may be different to another card in that stack?

Thanks in advance.

Scott