Resizing Windows

Lee's icon

Hi, I have a jit.window which I am drawing into. If I resize the window vertically, then the contents scale accordingly and still continue to fill the vertical space - if I resize horisontally then the contents don't scale the extra space is added to the left and the right to fill the resized window. I'd like both to scale appropriately when resizing the window. Is there some option that I need to set?

thanks, L