Never mind. Seems I'm using comctl32.ocx (older version)
when I thought I was using the newer version...

>For testing purposes I want to remove the tree view control
>from my system (to see what happens when it's not installed correct
>and the form starts..So I can ignore it.)
>
>I tried both
>regsvr32 mscomctl.ocx /U
>
>Then I deleted the three files with mscomctl*
>Then I restarted. The active X control still wokrs fine.
>
>How can this be?