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Oh so now you've put the right question. That's why it's always said, ask proper question to get proper answer.
Well, you need to implement the action listener to the box and then handle all the...

For me it resized exactly as i wanted it to be. Can you kindly explain it a little more that what do you want and what it's doing for you?

Well,

createCropper(rectangleWidth, rectangleHeight);
here you are actually creating the cropper, and passing it the width and height. Change the width and height and cropper will get the new...

Wrap your code in code tags.
// your code here
And which rectangle you want to resize?

Only the rectangle or the window?