fgStructure.CurrentWindow->State.WorkMask |= GLUT_VISIBILITY_WORK;
fgStructure.CurrentWindow->State.DesiredVisibility = DesireNormalState;
fgStructure.CurrentWindow->State.WorkMask |= GLUT_VISIBILITY_WORK;
fgStructure.CurrentWindow->State.DesiredVisibility = DesireNormalState;