Adding state to bean generated via CGLIB's BeanGenerator

Question

I see the following example code on how a Java Bean can be created dynamically. What I am not able to figure out is how I can update the state of an instance once created. So in the following example how can I set the value of foo to "footest" for instance bean?

BeanGenerator bg = new BeanGenerator();

bg.addProperty("foo", Double.TYPE);

bg.addProperty("bar", String.class);

Object bean = bg.create();

Thanks Kumar