Creating a Frame of an exact size

[Shell]

Hello all,

I'm creating a simple Frame object by extending it in my own class, and I've set the size using the setSize function, but it turns out the size required by the function has the title bar and border included, does anyone know how to create a window with a client area of, say 500,400? There must be some function the get the sizes of the borders and all, as they can change.

Thanks in advance,

Shel