Alpha Blending

Can someone please help me figure out how to use alpha blending in windowblinds themes?

I can't figure it out for the life of me.

I just want to make a theme with smooth corners and a 1 pixel 25% opaque border.

I've used .png and .tga with transparency, but when I use them in skinstudio, the corners are black instead of clear.

Someone, PLEASE help me.

Edit: Nevermind! I just figured it out.

If anyone else needs help, right-click the titlebar image on the right side of SS and select Apply/Simplify Alpha Channel

I feel real dumb right now.