In order for a cell in a listbox to be enterable, two conditions must be met:

1. The cell's column must be enterable


2. The On Before Data Entry event, $0 does not return -1

If the form event On Before Data entry returns -1; the cell will be un-enterable. By default, $0 is 0. The On Before Data entry form event can be used in both the listbox object, and the individual columns inside the listbox.

• If -1 is returned in the On Before Data Entry event within the listbox object, all cells in the listbox will be non-enterable.


• If -1 is return in the On Before Data Entry event within the Column of a listbox, all cells inside the column will be non-enterable

To programmatically make individual cells non-enterable, determine the cell position using LISTBOX GET CELL POSITION. Based off the cell position, set $0 to -1, or 0.

//Listbox object's method Case of   :(Form event=On Before Data Entry)     LISTBOX GET CELL POSITION(Listbox;$col;$row)     If($col=1)&($row=1) //makes the cell in the 1st column, 1st row non-enterable        $0:=-1     Else        $0:=0     End if End case