Something

		class WrappedEnterLeave : Control {
			StringBuilder sb;
			public WrappedEnterLeave (StringBuilder sb) {
				this.sb = sb;
			}

			protected override void OnEnter (EventArgs e) {
 				IContainerControl c = GetContainerControl ();
 				//sb.Append(String.Format("before Control.OnEnter: {0}, active = {1}", Name, c.ActiveControl));
				base.OnEnter (e);
 				sb.Append(String.Format("after Control.OnEnter: {0}, active = {1}", Name, c.ActiveControl));
			}

			protected override void OnLeave (EventArgs e) {
 				IContainerControl c = GetContainerControl ();
 				sb.Append(String.Format("before Control.OnLeave: {0}, active = {1}", Name, c.ActiveControl));
				base.OnLeave(e);
 				sb.Append(String.Format("after Control.OnLeave: {0}, active = {1}", Name, c.ActiveControl));
			}
		}

		[Test]
		public void ActiveControl4 ()
		{
			sb = new StringBuilder ();

			ContainerControl cc = new ContainerControl ();
			Control c1 = new Control ();
			WrappedEnterLeave c2 = new WrappedEnterLeave (sb);

			cc.Controls.Add (c1);
			cc.Controls.Add (c2);

			connect (c1);
			connect (c2);

			c1.Select ();
			c2.Select ();

			Console.WriteLine ("<");
			Console.WriteLine (sb.ToString ());
			Console.WriteLine (">");
		}