iOS Question [B4X] B4XPages - how to get page height

'This event will be called once, before the page becomes visible.
Private Sub B4XPage_Created (Root1 As B4XView)
    Root = Root1
    'load the layout to Root
    Root.LoadLayout("frm_main")
    Log(Root.Height)
End Sub

Private Sub B4XPage_Created (Root1 As B4XView)
    Root = Root1
    'load the layout to Root
    Sleep(0)
    Root.LoadLayout("frm_main")
    Sleep(0)
End Sub