Select Children when redirected to tabbed page

Hi

i have main page and when redirecting to Tabbed page , i want to select children based on selection. How can i acheive this?

  var masterPage = this.Parent.Parent as TabbedPage;
            if (masterPage != null)
            {

                masterPage.CurrentPage = masterPage.Children[3];

            }

masterPage.Children[3] has two tabs

Thanks and Regards,
Vinay