Ok, I've made a picture to show the problem:
That window was created with:
/window -k0 @EventsLog iconfile mirc.ico
In the top part, you can see how the channels bar looks when the custom window has been maximised.
In the second part, you can see the window (and it's new icon) when it's not maximised.
In both cases the icon in the channels bar stays like the default one. Is it possible to customise that icon?
Thx again