B4J Question Load multiple layout at same time one inside another

'TabPane one in the designer
#If B4J
Dim TP As TabPane=TabPane1.As(TabPane)
#End If

'Initializes the object. You can add parameters to this method if needed.
'You send the TabPane That was created in your MainPage '

Public Sub Initialize(TP As TabPane)
    'Create a TabPage and load it with a Name'
    Dim TPage As TabPage
    TPage=TP.LoadLayout("Login.bjl","Login")
    'If you want give the page a Tag Identification so you could activate or remove'
    TPage.Tag="A01"
    TP.SelectedIndex=TP.Tabs.Size-1
    ....Do whatever to initialize you class
End Sub

Sub Class_Globals
    Private Root As B4XView
    Private xui As XUI
    Private Button1 As Button
    Private Button2 As Button
    Private Button3 As Button
    Private Button4 As Button
    Private pncontent As Pane
End Sub
Public Sub Initialize
    B4XPages.GetManager.LogEvents = True
End Sub
Private Sub B4XPage_Created (Root1 As B4XView)
    Root = Root1
    Root.LoadLayout("MainPage")
End Sub
Private Sub Button1_Click
    pncontent.RemoveAllNodes
    pncontent.LoadLayout("page1_layout")
End Sub
Private Sub Button2_Click
    pncontent.RemoveAllNodes
    pncontent.LoadLayout("page2_layout")  
End Sub
Private Sub Button3_Click
    pncontent.RemoveAllNodes
    pncontent.LoadLayout("page3_layout")
End Sub
Private Sub Button4_Click
    pncontent.RemoveAllNodes
    pncontent.LoadLayout("page4_layout")
End Sub