West Brom slipped nearer the relegation trapdoor despite an own goal from Danny Shittu which earned them a 1-1 draw with Bolton.
Matt Taylor's second half goal - his eighth of the season - looked to have earned Bolton a first away win in four months.
But with eight minutes remaining Shittu deflected a low Robert Koren drive past Jussi Jaaskelainen for the equaliser.
Megson was sent from the dugout in injury-time after exchanging words with referee Howard Webb following the substitution of Johan Elmander by Ebi Smolarek.
Copyright (c) PA Sport 2009, All Rights Reserved.
Do YOU want to write for GiveMeSport? Get started today by signing-up and submitting an article HERE: http://gms.to/writeforgms