Hide/Unhide columns

[WineSnob]

I am trying to modify the Microsoft Contact Management Database template. On the Contact list form there is a hyperlink to Show/Hide Columns. The event is an embedded macro RunMenuCommand Command UnhideColumns. I cannot figure out how the popup form is linked to the table or how to modify the form. Any idea where the form resides or how to modify? I know I could start from scratch and build a form but am curious how it is working. No big deal just trying to learn something new. Thanks...