Toolbar icon transparency

[Eros Olmi]

Hi all,

I'm setting up form rebar with some with a toolbar on it.
Ill is working perfectly except icons transparency.
I tried alpha channel icons but nothing: transparent area is black colored when I execute application.
I tried pink color (255, 0, 255) but again nothing: pink area is black colored when I execute application.

What is the correct kind of icon to use for having transparency?

Thanks a lot
Eros

Attached few icons I've used.

[Eros Olmi]

OK found.

For some reasons original alpha channel is there but it seem not interpreted correctly. Maybe icons I'm using were converted from images to ico and I read here in forum that there can be some problems when this is done.

Anyway, I've edited my icons and deleted actual alpha channel and created again.
Now they are working fine.