Custom control with transparent background images

[Nitrof]

I would like to know how I can create an boolean control with transparent background. I would like to be able to have round shaped botton... And avoid putting grey corner. You see what I mean... If I put my control on different background. I want to have it's corner transparent.

Thanks

[altenbach]

There are quite a few round booleans that can be used as controls. All of them have transparent corners by default. (e.g. round LED (change to control and adjust the colors), round button(classic), Round stop button(classic), etc.).

They should work fine and will not show grey corners on any background.

If this is not what you mean, please clarify. Maybe attach a picture.