Facebook extenbded permission in tab application -

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How can I do this .. The following fan page tab application has this functionality

Click on the fourth tab and it will ask for extended permission .. I'm not sure how to do this .. Please help

There is a fbml tag for this:

Example: 

  Lt; Fb: prompt-permissions = "email" & gt; Do you want to receive email from our application? & Lt; / FB: sign-permission & gt;

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