Fixed the paginator UI problem during module swap.

Tho, this fix is kinda weird... There is a big difference between
Widget.get() + new and Widget.create();
The latter uses a fresh copy of the definition created by the registered
factory() to create a new instance.
Whereas the first only use one copy of widget definition, and create all
the new instances from it (this somehow won't work for our paginator
widget...)
need further investigation.