Windows Forms

/*
 * mr_robot test custom control
 * */
using System;
using System.Drawing;
using System.Windows.Forms;

namespace custCompTest2
{

	public class custCompTest2 : Form
	{
		public custCompTest2()
		{
			//kind of inline InitializeComponent()
			this.Name = "custCompTest2";
			this.Text = "custCompTest2";
			this.ClientSize = new System.Drawing.Size(400, 400);

			for(int n=0; n<800; n++)
				this.Controls.Add( (new tgC()) );
		
		}//~: custCompTest2()

		protected override void OnSizeChanged(EventArgs e)
		{
			this.SuspendLayout();
			int x=0, y=0, w=Width/40, h=Height/21;
			foreach (Control c1 in Controls)
			{
				c1.Location = new Point(x,y);
				c1.Size = new Size(w,h);
				if(x+w*2+1<Width) { x+=w; } else { x=0;y+=h; }
			}
			this.ResumeLayout(false);
		}
		
		protected override void OnLoad(EventArgs e)
		{
			this.OnSizeChanged(e);
		}
		
		// UPDATED!
		// kind of BAD SOLUTION from:
		// http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=2044742&SiteID=1
		/*
		protected override CreateParams CreateParams { 
			get { 
				CreateParams cp = base.CreateParams; 
				cp.ExStyle |= 0x02000000; 
				return cp; 
			} 
		}
		*/

		[STAThread]
		static void Main() 
		{
			Application.Run(new custCompTest2());
		}
	
	}//~: custCompTest2 : Form

	public class tgC : Control
	{
		public tgC()
		{
        	this.SetStyle(
            	ControlStyles.UserPaint | //paints itself and is not painted by the system operation.
            	ControlStyles.AllPaintingInWmPaint | // ignores the OnPaintBackground
            	ControlStyles.DoubleBuffer | // Double buffering
            	ControlStyles.ResizeRedraw  // repaint itself when resized.
            	, true);
		}
		
		protected override void OnPaint(PaintEventArgs e)
		{
			Graphics g = e.Graphics;
			g.DrawRectangle(Pens.Black, 1,1, Width-2, Height-2);
		}

	}//~: tgC : Control

}