How to call Tab Page pageActivate Method in Datasource initValue Mehtod??

Dear All,

This is Sreekant. Pretty new to Ax 2012 developement and i have a requirement that i need to keep the enum value fixed when user selects the tab. Now i want to check this method while creates the new record i.e in initValue. So i need to call pageActivate method in initValue mehtod. How can i achieve this? Plz suggest me??