load ListGrid viewState before the first autoFetchData

[enguerran]

I build a ListGrid.
I set this ListGrid with the setAutoFetchData(true).

I have some viewState that I want to load in the ListGrid.
My ListGrid is fetching data from Server with POSTXML.

Question:
Where may I have to put the call of "setViewState(String myViewState)" to set the view State before the first auto fetch?