z-order between opengl drawings and geometry layer

[accounts01]

hi!

so i followed the GPSAnimation tutorial and got the pulsing circle working just great. i also have a bitmap which i draw at the center of the pulsing circle as a Point in the Geometry Layer.

my problem is: the central bitmap is "below" the pulsing circle.

my questions:
1 how can i go about making the Geometry Layer go "above" the ?OpenGL Layer? ?
2 is the "Point in Geometry Layer approach" the recommended approach for drawing a bitmap overlay?

thanks!