Sorry for delay, I was not online for long time.
Actually you do not need to feed anything because listindex is a
property of a list and you can read this property to get your integer.
Or I might not understand your problem...
R.

This is from help:
The ListIndex property contains an index of the selected row in a list.
Values of ListIndex range from -1 to one less than the total number
of rows in a list (that is, ListCount - 1). When no rows are
selected, ListIndex returns -1. When the user selects a row in a
ListBox or ComboBox, the system sets the ListIndex value. The