Hey, I've made some custom signs for my map but I have no idea how to make them glow like the original ones:

This is the code I used in the VMT:

"LightmappedGeneric"
{
   "$basetexture" "signage/signage_overlay_hole"
   "$decal" 1
   "$surfaceprop" "glass"
   "$selfillum" 1
   "%keywords" "portal"
}

Any help?
Thanks.

Hmmm thats pretty weird, I'm no Magic man, but does it have an alpha or is this just a normal texture?

Normal, I just threw a jpeg image into the VTF, and then took a VMT from a original sign and changed the names.

You might need an alpha layer. Since you probably want the whole texture to be light, an easier way is to change the shader to UnlitGeneric.

You'd do better to take an existing sign and modify it, than try to make one from scratch, so that you have the correct alpha layer settings.

I did the UnlitGeneric thing but now its really white, So I'll do it with the alpha layer stuff, Can you Direct me to a tutorial or something like that? because I never experienced with that.
And how can I edit an existing sign?, Also, when I'm opening the new Portal VTFs I'm getting an error message, I'm running the last version of vtfedit.
Thanks.

Getting an error message usually means you're doing something wrong. How about posting the actual error you're getting.

This article looks like it should point you in the right direction to setting up what you need: http://developer.valvesoftware.com/wiki/Decals

Happens with the orange box VTFs only, I assume it's because the texture are running on a new version, But my vtfedit is the last version.

Edit - Okey I found out there is a new version, the error is fixed, Anyway msleeper thanks for the link, I'll look into that.