в .Нет 2.0 для пэйджи появилась новая фича - загрузка ViewState не по
индексу а по ID. Покапай может в этом направлении
msdn
By default, when a parent control loads view state into child controls it
creates, it does this by the position of each child control in the parent
control's Controls collection. When view state is initially applied, all
child controls might not have been created. In this case, the view state for
controls not yet created is saved, and applied when the child controls are
created later.

For a parent control to apply view state to its child controls, two
conditions must be met:

On postback, the parent control must create the child controls in exactly
the same order as the previous request so that the order of the controls
remains consistent.

After postback, any child controls created must be added to the end of the
parent control's Controls collection.

If these two conditions cannot be met, as in the case of the delayed
creation of a child control, the parent control can load view state by using
ID. To set the LoadViewStateByID property to true, use the
ViewStateModeByIdAttribute metadata attribute for the parent control.



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