`sig
val cast : 'a Gobject.obj -> Gtk.file_selection Gtk.obj
module P :
sig
val filename : ([> `fileselection ], string) Gobject.property
val select_multiple : ([> `fileselection ], bool) Gobject.property
val show_fileops : ([> `fileselection ], bool) Gobject.property
end
val make_params :
cont:(([> `fileselection ] as 'a) Gobject.param list -> 'b) ->
'a Gobject.param list ->
?filename:string -> ?select_multiple:bool -> ?show_fileops:bool -> 'b
end`