TabPage Font Bold in seperate class?

I found this cool tabpage font-to-bold code that works very well.

Q. How code this in a seperate class rather than on the same Winform with the actual TabControl1?

Here's what I have so far:

[WinFrom]

  public Form1()
        {
             InitializeComponent();

             new TabPageFont(this.tabControl1);
}


[TabPageFont.cs]

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Windows.Forms;

namespace Grammer
{
    class TabPageFont
    {
        internal TabControl tabControl;

        public TabPageFont()
        {
            // Initialize Components
            this.tabControl.DrawMode = System.Windows.Forms.TabDrawMode.OwnerDrawFixed;
            this.tabControl.DrawItem += new DrawItemEventHandler(this.tabControl_DrawItem);
        }

        private void tabControl_DrawItem(object sender, System.Windows.Forms.DrawItemEventArgs e)
        {
            Font fntTab;
            Brush bshBack;
            Brush bshFore;

            if (e.Index == this.tabControl.SelectedIndex)
            {
                fntTab = new Font(e.Font, FontStyle.Bold);
                bshBack = new System.Drawing.Drawing2D.LinearGradientBrush(e.Bounds, SystemColors.Control, SystemColors.Control, System.Drawing.Drawing2D.LinearGradientMode.BackwardDiagonal);
                bshFore = Brushes.Black;
                //bshBack = new System.Drawing.Drawing2D.LinearGradientBrush(e.Bounds, Color.LightSkyBlue , Color.LightGreen, System.Drawing.Drawing2D.LinearGradientMode.BackwardDiagonal);
                //bshFore = Brushes.Blue;
            }
            else
            {
                fntTab = e.Font;
                bshBack = new SolidBrush(SystemColors.Control);
                bshFore = new SolidBrush(Color.Black);

                //bshBack = new SolidBrush(Color.White);
                //bshFore = new SolidBrush(Color.Black);
            }

            string tabName = this.tabControl.TabPages[e.Index].Text;
            StringFormat sftTab = new StringFormat();
            e.Graphics.FillRectangle(bshBack, e.Bounds);
            Rectangle recTab = e.Bounds;
            recTab = new Rectangle(recTab.X, recTab.Y + 4, recTab.Width, recTab.Height - 4);
            e.Graphics.DrawString(tabName, fntTab, bshFore, recTab, sftTab);

        }
    }
}