ScorecardCanvas.groupTemplateCells Method
        
 Group the template cells.
 
         
        Parameters
        
            - templateCellVms
            
 
            - 
                
Type: Array
ElementType: TemplateCellViewModel
Template cell view models. 
            - groupId
            
 
            - 
                
Type: string - May be null
(Optional) The groupId to use. 
        
        Return Value
        
Type: String
        
The group ID, or null if cannot be grouped.