Success !!!
Sullotion:
Install latest indie build (http://www.shellfront.org/lsdev/)
Set Avant to show tray icon but not to minimize to it !!!

This will show avant in the sys-tray but will not successed in showing it in the task bar or the alt -tab bar.

thankes goes to:
pika - For finding the problem in the alt-bar too.

DeViLbOi - For puting the finger on avant registering the
icon incorrectly.

Egonz - For recommanding the to update to indie (updates the
modules + litestep).

Warma - For recommanding to go over avant's settings.