Curved Corner: only one side?

Hi,
when placing a rectangle and adding curved corners, I was wondering whether it's possible to curve only one side of the rectangle, say, the left one, not the right one?
It seems that each time I adjust the curviness, all corners change together.

Thanks for any help.

There's a Video on YouTube which shows one method: http://www.youtube.com/watch?v=m9HHyRqAOiE

Wow,
kind of tricky, but guess what? Works perfectly.
Thanks a lot for your help.
I first thought that there would be a way to first disable the dependance between each corner.

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I first thought that there would be a way to first disable the dependance between each corner.

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Unfortunately not. It has been requested a few times before though so maybe it will be added at some stage.