On this page:
get-column
set-column
Inherited methods:
from control-event%
get-event-type
set-event-type
from event%
get-time-stamp
set-time-stamp

A column-control-event% object contains information about a event on an list-box% column header.

(new column-control-event% [column column] 
  [event-type event-type] 
  [[time-stamp time-stamp]]) 
  (is-a?/c column-control-event%)
  column : exact-nonnegative-integer?
  event-type : (one-of/c 'list-box-column)
  time-stamp : exact-integer? = 0
The column argument indicates the column that was clicked.

(send a-column-control-event get-column)
  exact-nonnegative-integer?
Returns the column number (counting from 0) of the clicked column.

(send a-column-control-event set-column column)  void?
  column : exact-nonnegative-integer?

Sets the column number (counting from 0) of the clicked column.