FSX Beech 18 Package

I got this plane and the glass is not transparent in the VC. I've tried the following.
-Converted from bitmap to DDS using DXTBmp.exe
-Applied Alpha
-Inverted Apha
The best I get now is the glass flickers in and out of transperancy.
What else can I do?
The plane is found here
http://www.simviation.com/members/fsxprops20.htm
or
http://www.simviation.com/fsxprops20.htm
-Converted from bitmap to DDS using DXTBmp.exe
-Applied Alpha
-Inverted Apha
The best I get now is the glass flickers in and out of transperancy.
What else can I do?
The plane is found here
http://www.simviation.com/members/fsxprops20.htm
or
http://www.simviation.com/fsxprops20.htm