Something

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;

namespace Clipper
{
	public class MainForm : System.Windows.Forms.Form
	{
		public MainForm()
		{
			InitializeComponent();

			int x, y;

			for (y = 0; y < 10; y ++) {
				for (x = 0; x < 10; x ++) {
					Button b = new Button();
					b.Location = new Point (x * 40, y * 40);
					b.Size = new Size (30, 30);
					Controls.Add (b);
                                }
                        }

			SetStyle (ControlStyles.DoubleBuffer, true);
		}
		
		[STAThread]
		public static void Main(string[] args)
		{
			Application.Run(new MainForm());
		}
		
		#region Windows Forms Designer generated code
		private void InitializeComponent() {
			// 
			// MainForm
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
			this.ClientSize = new System.Drawing.Size(752, 493);
			this.Name = "MainForm";
			this.Text = "MainForm";
		}
		#endregion

		protected override void WndProc (ref Message m)
		{
			DateTime start = DateTime.MinValue;
			bool paint = false;

			if (m.Msg == 0x000F /* WM_PAINT*/)
				paint = true;

			if (paint)
				start = DateTime.Now;
			base.WndProc (ref m);
			if (paint) {
				Console.WriteLine ("time to paint = {0}", DateTime.Now - start);
			}
			
		}

                protected override void OnPaint(PaintEventArgs e)
                {
                        LinearGradientBrush lgbr =
                                new LinearGradientBrush(new Point(0, 0),
                                                        new Point(ClientRectangle.Width, ClientRectangle.Height),
                                                        Color.Blue, Color.Black);

                        e.Graphics.FillRectangle(lgbr, ClientRectangle);
                }
	}
}