Task List button on taskbar

[Siposs Attila]

Hi,

I don't know how but I've reached that there is a "Task List"
application on my taskbar, and I could not kick it out.

If I click on it to make this "running application" active, after 1 or
2 seconds it drops the focus, but no window appear after the click.

I did not find a referring process with top or ps so I do not know
what should I do. How can I kill this useless task?
Or is this really a task, or is it a bug?

Ati