object
method focuschange :
(Ext_selection_Model.t Js.t ->
Ext_data_Model.t Js.t -> Ext_data_Model.t Js.t -> 'a Js.t -> unit)
Js.callback Js.writeonly_prop
method selectionchange :
(Ext_selection_Model.t Js.t ->
Ext_data_Model.t Js.js_array Js.t -> 'b Js.t -> unit)
Js.callback Js.writeonly_prop
end