I've got an HTC Trophy.  A few weeks ago I get the Mango update.  One thing that constantly confuses me, about the phone, is the missed call notification, on my live tile, on the start page, of my phone.  I've seen it, and even called the person back, but that notification is still there, so I check it several times a day, thinking the person has called again and I've missed another call, but am wrong about that.

So, how do I clear that?