TextPrinter leaks

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using OpenTK.Graphics.OpenGL;
 
namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        private OpenTK.Graphics.TextPrinter printer = new OpenTK.Graphics.TextPrinter(
          OpenTK.Graphics.TextQuality.Default);
        private Font font = new Font(FontFamily.GenericSansSerif, 12);
 
        private int cnt = 0;
 
        public Form1()
        {
            InitializeComponent();
            Application.Idle += new EventHandler(Application_Idle);
        }
 
        void Application_Idle(object sender, EventArgs e)
        {
            glControl1.Invalidate();
        }
 
        private void glControl1_Paint(object sender, PaintEventArgs e)
        {
            GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
 
            GL.MatrixMode(MatrixMode.Modelview);
            GL.LoadIdentity();
 
            printer.Begin();
            printer.Print((cnt++).ToString(), font, Color.Azure);
            printer.End();
        }
 
        private void glControl1_Load(object sender, EventArgs e)
        {
            int w = glControl1.Width;
            int h = glControl1.Height;
            GL.MatrixMode(MatrixMode.Projection);
            GL.LoadIdentity();
            GL.Ortho(0, w, 0, h, -1, 1);
            GL.Viewport(0, 0, w, h);
        }
    }
}