Please, help

with this code:

    Dim pPane As XtremeDockingPane.Pane = Nothing
    Dim pPaneUlt As XtremeDockingPane.Pane = Nothing

    With DockingPane1
        pPane = .CreatePane(1, 150, 200, XtremeDockingPane.DockingDirection.DockBottomOf, Nothing)
        With pPane
            .Hide()
            .Title = "Seguimiento"
            .Selected = True
            pPaneUlt = pPane
        End With
        pPane = .CreatePane(2, 150, 200, XtremeDockingPane.DockingDirection.DockBottomOf, Nothing)
        With pPane
                .AttachTo(pPaneUlt)
            .Hide()
            .Handle = mAdjuntos.Handle
            .Title = "Adjuntos"
            pPaneUlt = pPane
        End With

        pPane = .CreatePane(3, 150, 200, XtremeDockingPane.DockingDirection.DockBottomOf, Nothing)
        With pPane
                .AttachTo(pPaneUlt)
            .Handle = mDocumentos.Handle
            .Hide()
            .Title = "Documentos"
            pPaneUlt = pPane
        End With
        pPane = .CreatePane(4, 150, 200, XtremeDockingPane.DockingDirection.DockBottomOf, Nothing)
        With pPane
                .AttachTo(pPaneUlt)
                .Hide()
            .Handle = mTareas.Handle
            .Title = "Tareas"
            pPaneUlt = pPane
        End With
    End With





With click on any pane:



all docking panes are opened, and i was finding something like this: