CanvasService.mergeSelectedTemplateCells Method
        
 Merges the selected template cells.
 
         
        Parameters
        
            - notUndoable
            
 
            - 
                
Type: Boolean - May be null
(Optional) Whether or not this split is horizontal. 
            - suppressWarning
            
 
            - 
                
Type: Boolean - May be null
(Optional) True to suppress warning.