Use this tool to select the switch that controls the lighting fixtures in the selected system.
 System Tools panel
System Tools panel
 Select Switch.
 Select Switch. 
  All components except those in the selected circuit are dimmed in the drawing area and the Switch System Editor toolbar displays.
 Finish Editing System to apply your changes or
 Finish Editing System to apply your changes or 
   Cancel to discard your changes.
 Cancel to discard your changes.