nah, i cant see how you can easily keep your grid 'real time' . the web is stateless in that the your client (browser) is uaware of the server - you could force the page autorefresh every n-minutes as HoraShadow suggests and redisplay the contents of your database table in the grid - resource heavy and no doubt a frustrating experience for any user (page refreshing).

personally i would reconsider the design - use a 'check for mew messages' button and/or maybe use email or sms to send notifications of new messages