Seems to work fine here with the EICAR test file (created with MSE real-time off, then re-enabled it and did a Quick scan).
First of all, a notification window popped up in the bottom-right corner, which I ignored.
Next, a warning message appeared in the MSE window.
Finally, once the scan had finished, the notification window disappeared but the MSE window has turned red (At risk) with a big red "Clean computer" button in it and the system tray icon has also turned red with a cross in it.
Maybe for certain types of virus it cleans/quaranteens automatically but EICAR certainly seems to give the desired behaviour. Red = something needs attending to, Green = all ok.