A suggestion for an alternative approach: Rather than passing a generic reference and then trying to make it more specific, pass a reference to the VI or the panel. In the subVI obtain the array of references to the controls. Using the Label.text property obtain a reference to the graph and from that get the cursor reference. It is somewhat cumbersome, but it will always work (so long as you have unique labels on the controls).
With what you are now doing you need to pass some information along with the generic reference to tell the subVI how to convert it back, so this is no different in that respect.
Lynn
