How can i add a new function to the Basic IVI class vi's?

I need to use the IVI vi's to control some instruments, let's say a DC Power Supply.
Since there's a DC Power supplyclass, i can used those VI's but waht if one of the VI's does not contains all the functions that i need?. How can i add more functions to the IVI classes?. What do i need to do to add a new function to the iviFGen class?

If you would like to try developing your own instrument driver (or modify the existing one), we have documentation, model instrument drivers, and driver templates to help at :
http://www.ni.com/devzone/idnet/development.htm
We also have a syndicate of third party vendors that specialize in National Instruments' products and services. Some of the vendors specialize in driver development. I would suggest contacting one of the Alliance members at:
http://www.ni.com/alliance

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