Hi Patrick,
The Sampler app is set up to make use of the “loginpage” setting of the UnpBootResources custom control. http://xcontrols.org/public/docs.html#doc-resources to disable the login page simply remove the loginpage custom property setting in the commonheader custom control in the design of the application.
Alternatively, enable session authentication on your server and login as someone who has editor access or higher to the database.
Hope this helps.
Matt