Pop-up Window (e.g., RTC Widget)

I really like the RTC Widget user experience. You click on a small clock icon,

and Blynk pops open a window from which you select the desired time zone,

It’s almost like an app within an app. Is there a way I can create my own custom user experience like this using Blynk? I think it’s perfect for things like settings that are configured only once (or updated infrequently).