<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=UTF-8" http-equiv="Content-Type"> </head> <body bgcolor="#ffffcc" text="#000000"> The [x] is really a "hint" that you can click to close. Many people don't know they can dismiss the bubbles, so we added the ability to close them by clicking anywhere including the [x]. I don't think there's a way to talk back to the app which popped up the notification, so I don't think its possible to make closing the bubble fire up, for example, the package manager. Mark </body> </html>