dynamically created controls an session state

[Julia]

Hi,

I have a search control which render drop down list box controls according
to XML file
all control have EnableViewState=False

I would like to use the Application dictionary in order to save the controls
state

1.When exactly in the control life cycle I should save the state?
2.When exactly I should get the state fro the dictionary and set the
controls?
3.How do I get the values of the control on post back? currently I am using
HttpContext.Current.Request.Form[controlId]

Thanks in advance.