PrintPreviewDialog截取了预览窗体生成过程中的截图，然后才生成页面，怎样去除？

补上代码如下：   

'打印预览
    Private PrintPreviewDialog1 As New PrintPreviewDialog

    Private Sub PrintPreview(ButtonM As Object, e As EventArgs)
            If FmPrint1() = False Then Exit Sub

            With Me.PrintPreviewDialog1
                .Document = PrintDocument1
                .DrawToBitmap(Image1, PanelContainer1.ClientRectangle)
                .FormBorderStyle = FormBorderStyle.None
                .ShowInTaskbar = False
                .WindowState = FormWindowState.Maximized

                .ShowDialog()
                Graphics1.Clear(PanelContainer1.BackColor)
                Graphics1.EndContainer(GraphicsContainerState1)
            End With
    End Sub

    Private Function FmPrint1() As Boolean
                    Image1 = New Bitmap(PanelContainer1.Width, PanelContainer1.Height, PanelContainer1.CreateGraphics)          'PanelContainer1.DrawToBitmap
                    Graphics1 = Graphics.FromImage(Image1)
                    GraphicsContainerState1 = Graphics1.BeginContainer()
                    Graphics1.CopyFromScreen(PanelContainer1.Location.X, PanelContainer1.Location.Y, 0, 0, PanelContainer1.Size)
                    AddHandler Me.PrintDocument1.PrintPage, AddressOf Me.PrintPage1 
    End Function

    Private Sub PrintPage1(ByVal sender As System.Object, ByVal e As System.Drawing.Printing.PrintPageEventArgs)
        e.Graphics.DrawImage(Image1, 0, 0)
    End Sub