Reset value by default for drop doown list inside a valueChangeListener

Question

Dear all,
I have two drop down list.
A valueChangeListener for the dropdown1.
Inside the valueChangeListerner i set the value to null for the dropdown2.
But after that the setter of the dropdown2 is call with the previous value selected by the user.
Why?
My bean are in request scope.
But I create a reset button and in that case it works but it 's not what i want.      
I look at now the JSF cycle, and I notice that the process events is called before the Update Model Values
I try to call FacesContext.getCurrentInstance().renderResponse() .
It doesn't work in fact.
Any idea?

Answer 1

It doesn't work.
But I find finally a way.
for each component I want to reset ,I specify a binding attribute.
and in my actionListener method ( I have attribute immediate at true, I don't know if it linked)
I call folowing code:
component.setSubmittedValue(null);
component.setValue(null);
component.setLocalValueSet(false);
but apparently i can use also the method: resetValue()
but it works well