tabcontrol.Initialize("TabControl")
nav1.Initialize("nav1")
nav2.Initialize("nav2")
nav3.Initialize("nav3")
nav4.Initialize("nav4")
tabcontrol.Pages = Array(nav1,nav2,nav3,nav4)
nav1.ShowPage(pageHome)
nav2.ShowPage(PageMyorder)
nav3.ShowPage(pageCredit)
nav4.ShowPage(pageSelf)
pageHome.TabBarItem=tbi
PageMyorder.TabBarItem=tbi2
pageCredit.TabBarItem=tbi4
pageSelf.TabBarItem=tbi5
Main.App.KeyController = tabcontrol
tabcontrol.SelectedIndex=index