change object size according to a data field

 Hello,
I try to set the width an the hight of an objects (rectangle) dynamicly according to a data field.

Example:
The value of the field "cp_value" is 1 -> the width and the hight of my rectangle "b_rect" is 1, too.
The value of the field "cp_value" is 2 -> the width and the hight of my rectangle "b_rect" is 2, too.

Has somebody a solution for that?

Thank you!

Christoph