Problem with window frame sizing

Is there a way to make different frames show up with different sizes? All that I know how to do is set the application window size, and then the frame sizes. My problem is that I want my first level to be a smaller screen, but it is surrounded by a lot of empty white space because I have to make my application window larger to accommodate later levels which will be bigger. Thank you for any advice you can give.

You can use the window control object to resize the application and frame windows during runtime.