Edit Combobox List Items Demo

[ShirleyMSmith]

This demo program shows one way to add, edit and delete items in a combobox list. It also allows moving list items up and down in the list. Plus it demonstrates loading the combobox list items into the combobox array from a data file.

This is a demo program, even though I think that almost all of the routines can be put directly into a larger program as they are.
If the routines are put into your program, watch for duplicate variable names that might be changed in these routines.