How do I resize a rounded rectangle in Illustrator without destroying the corner radius?

[GoingUp]

Using Illustrator CS2.

I draw a rounded rectangle with radius of 15. If I try to resize the rectangle to make it bigger, it screws up the corners and elongates them as I try to make it bigger. I've tried both the direct and selection tool, and a combination of trying shift, alt and control with each of the tools as well.

Image drawing a square in illustrator with rounded edges. Now you want to make one side longer and turn it into a rectangle. How do you draw it there and not screw up the corners?

 

[corkyg]

Try making the bigger rectangle and then rounding the corners with a 15 radius afterwards.