Low Level GL Example - 2.0b7

I'm looking for an example that uses the core OpenGL support.  I started trying to use the LowLevelGL example on the code.google site (link at the bottom), but it seems to have some issues with 2.0b7.  (all user issues?).

When I try to run the sketch as-is, I get the error 

      Cannot find anything named "PShader.FLAT"

which is thrown by line 25:

       shader = pg.getShader(PShader.FLAT);

I tried changing that call to loadShader(), but that produces the same error.  Just to keep going, I grabbed a blur shader and loaded that shader,  

That gets me by that error, but then throws the error:

      The mehod allocateDirectFloatBuffer(int) from the type PGL is not visible

which comes from line 28:

       vertData = PGL.allocateDirectFloatBuffer(12);

I assume the example and the implementation in 2.0b7 have drifted??  I couldn't find an updated example.  Could someone help me out here with either 1) pointers to fix these specific issues or 2) a pointer to a low level example?

The sample code is here:

Thank you!!