iOS Question Application is closed on iPhone

'Code module
#Region  Project Attributes
    #ApplicationLabel: Myapp
    #Version: 1.0.0
    'Orientation possible values: Portrait, LandscapeLeft, LandscapeRight and PortraitUpsideDown
    #iPhoneOrientations: Portrait
    #iPadOrientations: Portrait
 #End Region

Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'Public variables can be accessed from all modules.
    Public App As Application
    Public NavControl As NavigationController
    Public SQL1 As SQL
End Sub

Private Sub Application_Start (Nav As NavigationController)
    NavControl = Nav
    NavControl.NavigationBarVisible = False
    intro.Show
End Sub

Private Sub Page1_Resize(Width As Int, Height As Int)
   
End Sub

Private Sub Application_Background
   
End Sub

'Code module

Sub Process_Globals
    Private pg As Page
    Public csu As CallSubUtils
End Sub

Public Sub Show
    If pg.IsInitialized = False Then
        pg.Initialize("pg")
        pg.RootPanel.LoadLayout("intro")
       
        csu.Initialize
        csu.CallSubPlus(Me, "Next", 2000)
    End If
    Main.NavControl.ShowPage(pg)
End Sub

Sub Next
    loading.Show
End Sub

'Code module

Sub Process_Globals
    Private pg As Page
End Sub

Public Sub Show
    If pg.IsInitialized = False Then
        pg.Initialize("pg")
        pg.RootPanel.LoadLayout("loading")
    End If
    Main.NavControl.ShowPage(pg)
End Sub