No additional code is required except for the existance of a
dojoType="dojox.widget.Loader" node. It will listen for the start
and end of xhr* requests (via _ioSetArgs [ugh] and Deferred.prototype._fire ..
DEPRECATED: dojox.widget.Loader -- will be removed in version: 2.0
DEPRECATED: dojo.moduleUrl() use require.toUrl -- will be removed in version: 2.0
DEPRECATED: dojox.widget.Loader: dijit._Templated deprecated, use dijit._TemplatedMixin and if necessary dijit._WidgetsInTemplateMixin -- will be removed in version: 2.0