How to resume a page which is already opened in WP7?

For example : In P1 there are two buttons A and B,when i click A it takes me to P2 and when i come back to P1 and again click A it not working. But after i click B which takes to P3 and come back to P1 and click A its working,but button B is not.

I understand that an instance of that page is already running in the background. But don't know how to resume that page while clicking the button again.

Can anyone help with what should be done here?

没有正确的解决方案

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