ListView: Which columns was clicked?

Hi forum,

I use a listview (detailed view with several columns) in my projekt. I need
a functionality which allows the user to edit single cell values directly.
Thats why I need a possibility to find out which column index was clicked,
exactly: which cell was clicked. Using the listview events I just can figure
out which listview item he clicked, but not in which column the clicked item
is.
Can anybody show me how to get this column index?

Many thanks,
Torben