Is there a PageFunctions in silverlight

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Silverlight

I would like to create 5 pages where by navigation would be from one page to another in the following order.

Page1 -> Page2 -> Page3 -> Page4 -> Page5

Page2 and Page4 are intermediate pages (or could be in the middle of a transaction)

Now for example; if user navigates from Page1 -> Page2 -> Page3 and decides to click on Browser's(i.e. IE or FF) Back button world normally see Page2.

I would like to show Page1 instead of Page2 as it would mean a reverse of transaction which may also give wrong information and or inconsistency.

Is there a way to achieve this using Silverlight 3 Navigation Page.
I know that its possible in WPF with the help of PageFunction<t> is there an equivalent in Silverlight 3?

Thankyou very much in advance.