B4J Question xCustomListView lazy loading - What is the nature of this behaviour?

Sub xclv_VisibleRangeChanged (FirstIndex As Int, LastIndex As Int)
    Dim ExtraSize As Int = 10
    Log(FirstIndex & "," & LastIndex)
    For ii = Max (0, FirstIndex - ExtraSize) To Min(LastIndex + ExtraSize, xclv.Size - 1)
        Dim p As B4XView
        p = xclv.GetPanel(ii)
        If ii >= FirstIndex - ExtraSize And ii <= LastIndex + ExtraSize Then
            If p.NumberOfViews = 0 Then
                p.LoadLayout("2")
                Dim btn As Button = p.GetView(0).GetView(2)
                Dim img As ImageView = p.GetView(0).GetView(0)
                
                
                
                Dim crd As Cards
                crd.Initialize
                crd = xclv.GetValue(ii)
                btn.Text = crd.text
                
                img.SetImage(xui.LoadBitmap(File.DirAssets, crd.Image))
            End If
        Else
            If p.NumberOfViews > 0 Then
                p.RemoveAllViews
            End If
        End If
    Next
End Sub