In openGL, how can you get items to draw back to front?

Question

By default it seems that objects are drawn front to back. I am drawing a 2-D UI object and would like to create it back to front. For example I could create a white square

Answer 1

The following call will turn off depth testing causing objects to be drawn in the order created. This will in effect cause objects to draw back to front.

glDepthFunc(GL_NEVER);      // Ignore depth values (Z) to cause drawing bottom to top

Be sure you do not call this:

glEnable (GL_DEPTH_TEST);   // Enables Depth Testing