public void releaseHardwareBuffers(GL10 gl) {
   if (sSystemRegistry.contextParameters.supportsVBOs) {
     final int count = mGridList.getCount();
     for (int x = 0; x < count; x++) {
       Grid grid = mGridList.get(x);
       grid.releaseHardwareBuffers(gl);
     }
   }
 }