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Build a small extention of Task Standard controller!!!!-Help-Its urgent!!!


     I wanna build an extention of  Task StandardController.The purpose is given below:


   This extention should have a method in its constructor.This method should change the Status field of that individual task record from valu 'Read' to 'Unread'.


I will add an inline vf page in detail page of Task, as soon as it gets loaded ,the method in Constructor of extention class should change status field value from 'Read' to Unread' for that individual record!!! 


What exactly is the issue you are facing?