One of the things that is missing, was pointed out by Rebecca Riordan at the thread is the keeping of the state, if any of this form is closed it will lose it's properties, and because of that will be lost in the chain.
Some suggestions were made at that thread that would keep this information, you could try keeping
a hidden form with this information, or store information in a collection, or if you need persistence between sessions store it in the registry.
I'm looking to have some free time to make a version of these forms that would have persistence in the same session and in different sessions too.