How to disable autosizing of TListView.Column?


I'm setting:
lvFiles.Column[1].Width = - 2;
{same as lvFiles.Columns[1].Width = ColumnHeaderWidth}
because I want to resize my coumn.

and after that I want to get the Width of the Column IN PIXELS,
how can I do it?
lvFiles.Columns[1].Width still returns '-2'. How to get rid of it?

greetings (I'm using Delphi 5)