JSF Portlet navigation problem

[nisreen hyari]

Hi;
i am developing a JSF Portlet application and facing the following problem;
i have two portlets A and B, portlet B has 3 views, when i navigate from A to B and reaches the third view of B, i must go back to portlet A, but the problem is that when i navigate again from A to portlet B, i found B in the third view instead of the initial view.
i tried to put "<expiration-cache>0</expiration-cache>" for portlet B, but it does not work, do anyone have any idea on how i can solve the problem and reset portlet B to its initial state!!
Thanks in Advance