public final void enableSecondaryEventReceiver(final TWidget widget) {
assert (secondaryEventReceiver == null);
assert (secondaryEventHandler == null);
- assert (widget instanceof TMessageBox);
+ assert ((widget instanceof TMessageBox)
+ || (widget instanceof TFileOpenBox));
secondaryEventReceiver = widget;
secondaryEventHandler = new WidgetEventHandler(this, false);
(new Thread(secondaryEventHandler)).start();