Creating functions to handle objects

Hi Guys,

Curently I am developing Functions that modify the contents of listboxes, tho I've simply hard coded to achieve this. Is it possible to create an object, set the object = to the list box, hand the object into a function to change its values, then exit the function and set the listbox = to the object?

If someone could please provide a small example on how to do this that would be greatly appreciated!

Regards
jordan