Init/detach sequence, what am I missing?

I am confused about the 'proper' way to handle page inits and detaches, 
w/regards to persistent variables.

Let's say I have a page with one persistent variable, 'vr', so have a 
setter which fires a change notification:
  public void setVr(VacationRequest vr) {
    this.vr = vr;
    fireObservedChange("vr", vr);
  }
I have a detach, as follows:
  public void detach() {
    vr = null;
    super.detach();
  }
and ideally, I have an initialize, as follows:
  protected void initialize() {
    setVr(new VacationRequest());
  }

The problem is that since detach calls initialize, I get an exception 
saying, to paraphrase, that I am trying to modify a persistent variable 
after a commit. Now I understand why this is happening, and could simply 
do this:
  protected void initialize() {
    vr = new VacationRequest());
  }

But I would rather call my setter, that's why it's there for. And the 
setter does need to have the fireObservedChange call for use in other 
contexts.

So what am I missing here? Is there Is there any way at page 
initialization time to use your setters, and still have those setters 
have the change notificaiton calls in them, so they behave properly when 
called in other contexts?





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