loading2 doesn't work with tabbedcontent

The loading2 widget doesn't work in combination with TabbedContent. Go to 'Zoek adres' on the following site: http://www.geodan.nl/geodan-demo/www/index.html
Fill in under 'Straat:' *markt This is typically a request which takes quite some time. The 'Zoeken' tab-containter empties, but no loader widget is shown. Once the result of the query comes in the 'Resultaat' tab container is filled with the result.

Desirable would be one of the following options:

• The loading widget is shown in the 'Zoeken' tabcontainer
• The loading widget is shown in the 'Resultaat' tabcontainer and after 'zoek' is pressed the TabbedContent switches to the new tabcontainer