As of E+ 9.4, a window may reference multiple WindowShadingControls/Shades. You can then set each WindowShadingControl's shading control type to OnIfScheduleAllows and define schedules across the multiple WindowShadingControls such that only one shade is active for a given period. timestep. If you don't know the schedule in advance, you can use an EMS program to actuate the schedules.