WebListBox Add button in the Columns Edit window

What does the Add button do when I’m editing Column Names in the little window that pops up when hitting the Edit Pencil icon on a WebListBox in the IDE? It appears to add a row to the IDE depiction of the ListBox, but I’m not sure what that is really doing.

It adds a row so you can pre-populate the listbox with data.

Of course. Thanks Greg.