[Seaside] Help with understanding how #call: works

[Squeaker]

Greetings,

I have two components A and B and I have the following code in A.

renderContentOn: html
	self call: B new.

What I was expecting is that B would be rendered.

(I suspect that there would be problems when B answers but for this 
experiment, this was not my concern yet.)

My question is: Why doesn't B get rendered?  All I get is a blank screen.

And, I know this a contrived example and is probably not something one 
would normally do.  I just want to understand why this does not work.

Many Thanks,
Frank