Popup Dialog? topic

Tried searching various topics, but I'm probably not using the right wordage here... Basically, I'm looking for either a Nexus ROM, app, or replacement messenger that utilizes popup dialogs (ie. I receive a text, a popup box appears on the screen with an option to mark as read, reply or close/delete). I've tried a few 3rd party apps from the Play Store and they've been buggy, but I'd rather use something that's included in a ROM or a flashable replacement messenger.

Thanks in advance for any recommendations/suggestions!