CanvasService.sendBackward Method
        
 Send the selected objects backward.
 
         
        Parameters
        
            - allTheWay
            
 
            - 
                
Type: Boolean
True to send to background. 
            - viewModels
            
 
            - 
                
Type: Array - May be null
ElementType: DesignObjectViewModel
(Optional) The view models to set z-index. Null to default to selection.