CanvasService.changeSelection Method
        
 Notify this service that selection state has been modified.
 
         
        Parameters
        
            - viewModels
            
 
            - 
                
Type: Array
ElementType: CanvasSelectableViewModel
A list of viewmodels with modified selection state. 
        
 
        Remarks
        
Execution of this function will also remove references of disposed viewModels from this service.