Reference loss when created by Dynamic VI

Hello,
I am actualy designing a program using a Model-View-Presenter Template.
Views and presenters are contretized by dynamic lauched Vis.
Models are shared between Presenters using LV References.
Main models are instantiated by the main presenter. Others models, that might belong to main models can be instantiated by sub presenter within sub presenter thread.
Using execution-trace I noticed that all references created in sub presenter thread are destroyed when thread stops.
That is very annoying because the aim of sub presenters is to modifiy and eventualy create sub models. And if sub models can not be reused after sub presenter is destroyed, my design pattern will never work.
Does anybody ever met this situation?
Is there any way to ask labview runtime to keep valid references created in dynamic launched VI when this one stops?
thanx for answer.
Pierre

And reference creation goes that way :
Then I have to cast reference for specific models.
Now it's time to make a f****** script to automaticaly modify my 50 model classes already created.
thanx for you help.

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