Graphic has shadows in imagelist if set to custom size

Hi!

I'm developing a IE Toolbar and I try to add some icons to it. Everything works fine if the graphic is 16x16 px, but if I set the Imagelist to custom format (80 width x 16 height) then a 1 px black 'shadow' is displayed under my graphic. I use grey as MaskColor.
Any idea where this shadow comes from?
eisenlauerAsked:
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Richie_SimonettiIT OperationsCommented:
5) Are you that maskcolor match with image EXACTLY?
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Richie_SimonettiIT OperationsCommented:
1) Did you set custom property and size of imagelist before add any graphic?
2) Are you sure that images are exactly 80x16px?
3) could you check it with a graphic program?
4) did you try setting , in example, 79x15px and see what happens?
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eisenlauerAuthor Commented:
1) yes
2) yes
3) Photoshop says: 80x16
4) this shrinks the pic by 1 px. nothing more.

I created a small sample that displays it a little bit more in detail:
http://www.krasserchecker.de/sample.jpg
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Richie_SimonettiIT OperationsCommented:
Please, don't accept any question that not meet your requirements, even with C grade. It would be better if you ask for delete it or refund points.
C grade is no good for you, no good for me.
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