How to load last situation of page in Silverlight ?

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Silverlight

Hi,
I am developing a silverlight application. At app. there is a page which has lots of controls when user load them to page.For example, there is a combobox, user selects a a button control from combo , button is placed on page. When user clicks it ,the button shows a grid.I want, when I user goes another page , and after returning to this page , page should be loaded with button(the button should be seen with grid as expanded).
How can I control this sitıation ?
Thanks for the replies in advance..