Private Sub ListViewxxx_FormClosing(ByVal sender As Object, ByVal e As FormClosingEventArgs) Handles ListViewxxx.FormClosing
    If e.CloseReason <> CloseReason.MdiFormClosing Then
        e.Cancel = True
        ' Nascondo il form
        CType(sender, ListView).Visible = False
        ListViewxxx.MinimizeBox = True
    End If
End Sub