Can't print label inside a picture

Although the form render as expected after Show(), when it's time to draw the image to the canvas the label seems to disappear when it's inside a picture whether it's a PictureBox or Label with a bg image.

Upon further checking it looks like the picture is being drawn at front even when I'm sending it to back. Any solutions?

  public partial class SampleForm: Form
{
    public SampleForm()
    {
        InitializeComponent();
        label1.BringToFront(); //plain label with bg color

        label2.SendToBack(); //label with a bg image
    }


    Bitmap original;
    Bitmap bitMaptoPrint;
    private void captureFromScreen()
    {
        
       original = new Bitmap(panel1.Width, panel1.Height);
       panel1.DrawToBitmap(original, new Rectangle(0, 0, panel1.Width, panel1.Height));
       bitMaptoPrint = new Bitmap(original,new Size(816, 1056));
    }

    private void printDocument1_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
    {
        Rectangle m = new Rectangle(0, 0, 816, 1056);
        e.Graphics.DrawImage(bitMaptoPrint, m);
    }

    private void button1_Click_1(object sender, EventArgs e)
    {
        captureFromScreen();
        printPreviewDialog1.ShowDialog();
    }

}

One option would be to implement your captureFromScreen() method by really capturing the screen using Graphics.CopyFromScreen(). This way it should be WYSIWYG (helping avoid the "awkward" and constant shifting of the z-order you describe in your comment).

PrintPreviewDialog _printPreview = new PrintPreviewDialog();
private void captureFromScreen()
{
    Bitmap bitmap = new Bitmap(panel.Width, panel.Height);
    var screenLocation = PointToScreen(panel.Location);
    using (var graphics = Graphics.FromImage(bitmap))
    {
        graphics.CopyFromScreen(screenLocation, Point.Empty, panel.Size);
    }

    PrintDocument document = new PrintDocument();
    document.PrintPage += localPrintPage;
    _printPreview.Document= document;

    _printPreview.ShowDialog();

    void localPrintPage(object sender, PrintPageEventArgs e)
    {
        e.Graphics?.DrawImage(
            bitmap,
                (e.PageBounds.Width - bitmap.Width) / 2,
                (e.PageBounds.Height - bitmap.Height) / 2,
                bitmap.Width,
                bitmap.Height);
    }
}

Test

public partial class MainForm : Form, IMessageFilter
{
    public MainForm()
    {
        InitializeComponent();
        Application.AddMessageFilter(this);
        Disposed += (sender, e) => Application.RemoveMessageFilter(this);

        Label label = new Label
        {
            Name = "label1",
            Text = "Label",
            Location = new Point(0, panel.Height/2),
            Size = new Size(panel.Width, 80),
            BackColor= Color.FromArgb(231, 134, 131),
            TextAlign = ContentAlignment.MiddleCenter,
        };
        panel.BackColor = Color.Azure;
        panel.Controls.Add(label);
        panel.Controls.SetChildIndex(label, 0);
    }
    const int WM_KEYDOWN = 0x0100;
    public bool PreFilterMessage(ref Message m)
    {
        if(m.Msg.Equals(WM_KEYDOWN))
        {
            switch((Keys)m.WParam | ModifierKeys) 
            {
                case Keys.Control | Keys.P:
                    BeginInvoke(new Action(()=> captureFromScreen()));
                    return true;
            }
        }
        return false;
    }
    .
    .
    .
}

The problem comes from the fact that DrawToBitmap() draw controls inside containers in reverse order. Solution is pretty straightforward just bring it to back, before every print.

private void button1_Click_1(object sender, EventArgs e)
{
    picturebox1.sendToBack();
    captureFromScreen();
    printPreviewDialog1.ShowDialog();
}