Custom control toolbox icon transparency

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GG - 19 Jul 2004 10:36 GMT

I create a custom control and I have added the 16x16 bmp embedded in the project. All works properly (the icon is correctly displayed in the toolbox) but I haven't figured out how to set the transparency color. Since the .bmp format doesn't have this feature, I think that Visual Studio chooses one color from the icon but I don't understand how. I found that VS doesn't choose always the same color or the same palette index (some of the icons in the toolbox have the transparency and some don't).
Does anyone find out how this feature is set?
Thanks

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Mick Doherty - 19 Jul 2004 11:22 GMT

bottom left pixel color.

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Mick Doherty
http://dotnetrix.co.uk/nothing.html

> I create a custom control and I have added the 16x16 bmp embedded in the project. All works properly (the icon is correctly displayed in the toolbox)

but I haven't figured out how to set the transparency color. Since the .bmp
format doesn't have this feature, I think that Visual Studio chooses one
color from the icon but I don't understand how. I found that VS doesn't
choose always the same color or the same palette index (some of the icons in
the toolbox have the transparency and some don't).

> Does anyone find out how this feature is set?
> Thanks

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GG - 19 Jul 2004 14:22 GMT

> bottom left pixel color.

Thanks Mick, it works fine!
Only one detail: VS dowsn't make transparent only the color in that pixel but uses some sort of threshold and makes transparent also "similar" colors.

Thanks again for the reply

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Custom control toolbox icon transparency

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