Doors and Windows - Broken Thermalpane casment window.

I have casement windows in the kitchen. It is a three view window with two crank out side windows and one stationary center. The center one is broken on the inside. Being a thermal pane, the outside pane is in tact. My question is, how do you get the center window out??? There are no screws on the inside of the frame of the adjacent crank out windows. The outside is vinyl clad so there is no indication of fasteners there. Inside is wookwork with no latches on the sash. What is one to do??? Surely there must be some way to get the window out without tearing out the whole thing. In the woodwork there is a plug. Could there be a screw or latch behind there if I drill it out. Maybe the center window is on the same assembly as the crank outs, and once the screw or latch is loosed, just push the window out and replace. Could I be right??? Any advice or help would be greatly appreciated.
Thanks
Marley.

There's a retainer (on all 4 sides of the window) that is keeping the IG unit in place. May be outside (vinyl), but more than likely it is inside (wood). You'll have to find it, remove it and measure the IG unit in all 3 directions (width, height, AND THICKNESS), then order a new IG unit to replace it. Usually takes about a week to get the new unit.

Look in the corner of the glass and see if you see the AW ( Andersen) trademark in a sort of a triangle looking symbol.

If that's the case, ( an probably other brands as well) you remove the "step" moulding trim on the inside that butts up to the glass part....you have to take a real small pry bar and take the bottom or piece off first, then the side pcs. They are nailed on with some small brads. Once you remove the wood trim, you'll see the "straps" that hold that center sash, they are stapled to the side frame......just pry them loose and you can bump the center sash to the outside.....have someon there to catch it :)

Now take the whole sash to a glass shop.

Thanks for the help guys. I took your advice, but it dosen't look like my window resembles any of your ideas. This window is a Harvey window and am I sorry I went with this window. The next windows I get will be Anderson. Back to the problem. I am going to be brave and try the plug I spoke of in my first message. The center window can be moved on one side which makes me think it is on a slide out track like the cranke outs. The other side dose not move at all. It must pivot on that side. Well tomorrow is another day, and I will probably ruin the wood work. 'till then. Thank you, I will let you know the outcome.:( Marley.

marley,
many of the centers I have worked on in MA are held in with clips which are secured with metal retainers at one side of the center sash and the other to the inside of the window jam........to access- remove the trim wood around the interior jams of the center sash.....
.The movement might be indicative of broken or loose retainers......
www.harveywindows.com