(Dbf_queryGUI.query_gui_input -> 'a) ->
(Dbf_queryGUI.query_gui_input -> 'b) ->
Dbf_queryGUI.query_gui_input ->
object
method private _cb__cancel_button_clicked : unit -> unit
method private _cb__ok_button_clicked : unit -> unit
method private _grab_input : Dbf_queryGUI.query_gui_input
method start : unit -> unit
end