mdd100ai

Hi! I am just trying to adapt this VI to changing the content of a MathScript Node, but unfortunately I could not find out how to create such a object class constant. When I try to create a constant from the VI's input, I get a "Generic" and cannot even change it to "Formula" as given in the example, because it is not listed. Could anyone please tell me how to create such a constant! And back to my original problem: Is it possible to change the MathScript code in a VI that is not yet running, but is supposed to run after the change? I think LV need to compile the node - can it do so while it is running? Thanks a lot, Christian