AlertDialog.choose

void choose(gtk.window.Window parent =  null,  gio.cancellable.Cancellable cancellable =  null,  gio.types.AsyncReadyCallback callback =  null)

This function shows the alert to the user.

The callback will be called when the alert is dismissed. It should call gtk.alert_dialog.AlertDialog.chooseFinish to obtain the result.

It is ok to pass NULL for the callback if the alert does not have more than one button. A simpler API for this case is gtk.alert_dialog.AlertDialog.show.

Parameters

`parent`	the parent gtk.window.Window
`cancellable`	a gio.cancellable.Cancellable to cancel the operation
`callback`	a callback to call when the operation is complete