DirectGui transparency issue

[Epihaius]

@lebdev

I am making a gui for a game using directGui. I am using egg texture cards. The textures used are png images.
I am drawing the gui on top of a background image. The gui elements are DirectButtons.
My issue is that part of the border on the png image shows in the scene as a thin grey line that was supposed to be transparent. The parts of the geom that should be transparent are transparent, it is just that it seems you can see a thin border where the image border should be that remains grey instead being transparent.

That sounds like the issue described at the bottom of this manual page.
Have you already tried setting the wrap mode of the texture to WMClamp? See this thread for more info.