A window screen assembly for a window, which is disposed in a window frame. This assembly can include a housing coupled to a window frame, at least one screen disposed in the housing window frame, and at least one lock for selectively locking the screen to the window. In this case, the screen can be locked to the window, so that it moves with the window in the window frame. An end attachment element can also be coupled to the screen wherein this attachment element can be designed to either stand up in a window to allow attachment to the lock or catch on the window or to lay flat to allow for inactivity and detachment of the screen from the window.