>Thanks William. In this case I want to see two columns but since column 2 is reserved for the pointer (and already invisible) I need to simulate a second column with a vertical bar in the middle of column 1.

Why? Add a third column, and
this.columnwidths="200,0,130"
- put your numbers, of course, but the zero for the second column should do the trick.
Haven't used this on listboxes, but if it works so fine on combos...