don't setup callback until it is needed.
don't setup callback until it is needed.

EricSchles/veyepar,CarlFK/veyepar,EricSchles/veyepar,xfxf/veyepar,yoe/veyepar,CarlFK/veyepar,EricSchles/veyepar,xfxf/veyepar,yoe/veyepar,yoe/veyepar,EricSchles/veyepar,xfxf/veyepar,yoe/veyepar,EricSchles/veyepar,CarlFK/veyepar,CarlFK/veyepar,xfxf/veyepar,yoe/veyepar,CarlFK/veyepar,xfxf/veyepar