Um ... you do need several other OpenGL calls to properly set up a context with bglCreateContext. It would be easier to modify the module code for Graphics instead, to include BGL_ALPHABUFFER as a flag.
As a side note, a bglCreateContext always creates a Depth buffer whether you want one or not, I don't know why.
As a side note, a bglCreateContext always creates a Depth buffer whether you want one or not, I don't know why.