vector - How to modify the corner radius on rounded rectangle in Illustrator?

I always ended up just creating a new rounded rectangle if the existing one don't work. Is there a way to modify the corner radius without having to create a new shape?

I know I can modify the bezier handle manually one-by-one, but I can't figure out how to do this in a more accurate way for all 4 corners.

Answer

In the new Adobe Illustrator CC, you can use 2 easy methods to change the corner radius of a rounded corner rectangle that has already been drawn:

Simply hold and drag the round blue handles in each corner.

You can change the border radius of all four corners with precision by using the Shape Options and simply enter a new measurement for your corners.

To change only one corner or give a different corner radius value to each of them, click the chain in the middle and fill the corner radius field for each corner.