RepeaterModel.removeGroupsAt Method
        
 Removes groups starting at the specified index from the model.
 
         
        Parameters
        
            - index
            
 
            - 
                
Type: Number (Integer)
An index in the groups array at which to remove groups. 
            - count
            
 
            - 
                
Type: Number (Integer)
(optional) The number of groups to remove starting at index. If not specified, one group will be removed.
Optional: True