Is there a specific control for the "Connecting to a service" window? Or is it a flyout-type control (or something else) with an embedded WebView?
Thanks.
That looks like the WebAuthenticationBroker used to connect to oAuth providers. It hosts an internal WebView and manages the callbacks to support single-sign-on via your identity provider.
See Authentication and user identity (C#/C++/VB) and the Web authentication broker sample for details.