I am currently working on public community portal which used for help to reduce cancer for woman. is any widget or gadgets like facebook light box available?, so users can login and user HV inside of my apps.
Unfortunately we have not built that feature yet. It is on our backlog of items to implement (pop-up auth) but it is not currently available. You can however do your own implementation of it by opening the target in a new window yourself. I have written
a blog post on it on our MSDN blog last year: