RepeaterCanvas.group Method
        
 Group the design object or existing groups.
 
         
        Parameters
        
            - groupMembersOrGroup
            
 
            - 
                
Type: Array
ElementType: CanvasSelectableViewModel
View models of the groups or group members to create a group 
            - transaction
            
 
            - 
                
Type: Transaction - May be null
(Optional) Transaction to perform the grouping. If not provided, a new transaction will be used. 
            - groupName
            
 
            - 
                
Type: String - May be null
(Optional) Name of the group. 
        
        Return Value
        
Type: SelectionGroupViewModel
        
The view model of the group.