I have MW Single pane windows. (http://www.mwwindows.com/vinyl/classic/cl-sh.asp)

I am trying to understand how to temporarly remove the upper sashs so I can swing in drywall on the second floor.

There are 2 metal screw clips , one on each side just below the upper sashs. When removed the window still does not move.

Can anyone help me undersatnd how to pull the upper sash out ?