Dear Developers 
If you handle cluster controls of a vi with references to them, Labview provides a variant Data if you comnect the reference (not strictly typed) to a property node and choose value as property. 
With the VariantToData Vi and the structur information - a constant copy of the cluster - you get the data back. 
How could I get the data back, if I only have the reference. 
Have I to deal with the type discriptor?  
My aim is to lay down all setup information in one cluster and give all involved vis only a reference to this control (but not a strictly typed one) 
regards 
Peter