SelectionAdorner.subscribeDesignerSnapChanged Method
        
 Subscribe a handler to designerObjectSnapChanged event
 
         
        Parameters
        
            - callback
            
 
            - 
                
Type: Function
The event handler to call when designerObjectSnapChanged event is raised. 
            - once
            
 
            - 
                
Type: Boolean - May be null
(Optional) True to subscribe a one time handler 
            - unbind
            
 
            - 
                
Type: Boolean - May be null
 (Optional) True to unbind the handler.