Customs 1949 Mercury - Inner Garnish Moulding Removal

Need to pull the drivers door panel off my '49 Merc. I get that the panel itself is attached to the door with clips. I get that before I pop the panel off; I need to remove the upper window garnish moulding / vent window ***embly. I have removed the 4 screws; but what is it that retains the vent window from popping out of the door?
Thanks!

 

HI. 1949 mercurys . Originally Vent window ***y comes out with garnish. Vent window ***y are originally riveted to garnish.