Printform对话框出现在PrintPreview中

Question

我创建了一个用于计算HVAC设备的应用程序。一切都好（My last question in this app），但我面临一个新问题。当我单击打印按钮然后选择打印机时，打印预览对话框会显示打印机选择对话框的跟踪。

我尝试了不同行的睡眠功能，但它不起作用。 我该如何修复我的应用？ 这是我的代码：

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    Button1.Visible = False
    ComboBox1.Visible = False

    PrintDialog1.PrinterSettings = PrintForm1.PrinterSettings
    PrintDialog1.AllowSomePages = True
    If PrintDialog1.ShowDialog = DialogResult.OK Then

        Thread.Sleep(3000)

        With Me.PrintForm1
            PrintForm1.PrinterSettings = PrintDialog1.PrinterSettings
            .PrintAction = Printing.PrintAction.PrintToPreview

            Dim MyMargins As New Margins

            With MyMargins
                .Left = 40
                .Right = 40
                .Top = 40
                .Bottom = 40
            End With

            .PrinterSettings.DefaultPageSettings.Margins = MyMargins

            PrintForm1.DocumentName = notasyon_lbl.Text

            .Print(Me, PowerPacks.Printing.PrintForm.PrintOption.CompatibleModeClientAreaOnly)

        End With

    End If

    Me.Close()
End Sub