A little help with blending and glx

I have the example code below, simplified from a larger project. I have
been trying to make alpha channels work i have enabled blending and written
a similar example using pygame which works. How ever setting up opengl to
work with a glx context seems to stop blending from working, i have a
feeling i need to enabel some parameter to the gl context setup but have
not been able to find out what that parameter is.

Any suggestions on why this is not working, i have tried on two different
machines one with high end radeon and another with an intel graphics card
both do the same however.

http://pastebin.com/vTDspSwp

Any help would be most appreciated.

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