How to expand control past screen size in scrollable panel

partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;

/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
    if (disposing && (components != null))
    {
        components.Dispose();
    }
    base.Dispose(disposing);
}

#region Windows Form Designer generated code

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
    this.pictureBox1 = new System.Windows.Forms.PictureBox();
    this.hScrollBar1 = new System.Windows.Forms.HScrollBar();
    ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).BeginInit();
    this.SuspendLayout();
    // 
    // pictureBox1
    // 
    this.pictureBox1.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom) 
    | System.Windows.Forms.AnchorStyles.Left) 
    | System.Windows.Forms.AnchorStyles.Right)));
    this.pictureBox1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;
    this.pictureBox1.Location = new System.Drawing.Point(13, 13);
    this.pictureBox1.Name = "pictureBox1";
    this.pictureBox1.Size = new System.Drawing.Size(259, 216);
    this.pictureBox1.TabIndex = 0;
    this.pictureBox1.TabStop = false;
    this.pictureBox1.Paint += new System.Windows.Forms.PaintEventHandler(this.PictureBox1_Paint);
    this.pictureBox1.Resize += new System.EventHandler(this.PictureBox1_Resize);
    // 
    // hScrollBar1
    // 
    this.hScrollBar1.Anchor = ((System.Windows.Forms.AnchorStyles)(((System.Windows.Forms.AnchorStyles.Bottom | System.Windows.Forms.AnchorStyles.Left) 
    | System.Windows.Forms.AnchorStyles.Right)));
    this.hScrollBar1.Location = new System.Drawing.Point(13, 232);
    this.hScrollBar1.Maximum = 5000;
    this.hScrollBar1.Name = "hScrollBar1";
    this.hScrollBar1.Size = new System.Drawing.Size(259, 20);
    this.hScrollBar1.TabIndex = 1;
    this.hScrollBar1.ValueChanged += new System.EventHandler(this.HScrollBar1_ValueChanged);
    // 
    // Form1
    // 
    this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
    this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
    this.BackColor = System.Drawing.Color.White;
    this.ClientSize = new System.Drawing.Size(284, 261);
    this.Controls.Add(this.hScrollBar1);
    this.Controls.Add(this.pictureBox1);
    this.Name = "Form1";
    this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
    this.Text = "Form1";
    ((System.ComponentModel.ISupportInitialize)(this.pictureBox1)).EndInit();
    this.ResumeLayout(false);

}

#endregion

private System.Windows.Forms.PictureBox pictureBox1;
private System.Windows.Forms.HScrollBar hScrollBar1;
}

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();

        canvasWidth = 1000000 * (elementWidth + elementGap);
        CalcSize();
    }

    private readonly int elementWidth = 60;
    private readonly int elementGap = 10;

    private readonly Font font = new Font("Arial", 14);

    private int displayWidth;

    private int canvasWidth;
    private int offset = -1;

    private void PictureBox1_Paint(object sender, PaintEventArgs e)
    {
        // nothing to do!
        if (offset == hScrollBar1.Value) return;
        offset = hScrollBar1.Value;

        var gr = e.Graphics;

        // Set text rendering mode
        gr.TextRenderingHint = TextRenderingHint.AntiAlias;

        // Calculate cell positioning
        var step = elementWidth + elementGap;
        var count = (hScrollBar1.Value / step) + 1;

        using (var br = new SolidBrush(Color.Red))
        {
            for (int i = 0; i < displayWidth; i += step)
            {
                gr.DrawString(count.ToString(), font, br, i, 50);
                count++;
            }
        }
    }

    private void HScrollBar1_ValueChanged(object sender, EventArgs e)
    {
        pictureBox1.Invalidate();
    }

    private void PictureBox1_Resize(object sender, EventArgs e)
    {
        CalcSize();
    }

    private void CalcSize()
    {
        displayWidth = pictureBox1.Width;

        var max = canvasWidth - pictureBox1.Width;
        hScrollBar1.Maximum = max;
        if (hScrollBar1.Value > max) hScrollBar1.Value = max;

        hScrollBar1.LargeChange = displayWidth;
        hScrollBar1.SmallChange = elementWidth + elementGap;
    }
}