Controlの継承について

public class MyControl : System.Windows.Forms.Control {
	public MyControl() {
	}

	private const int WS_BORDER        = 0x00800000;
	private const int WS_EX_CLIENTEDGE = 0x00000200;
	protected override CreateParams CreateParams {
		get {
			CreateParams p = base.CreateParams;
			switch(this.BorderStyle) {
				case BorderStyle.FixedSingle : {
					p.Style |= WS_BORDER;
				} break;
				case BorderStyle.Fixed3D : {
					p.ExStyle |= WS_EX_CLIENTEDGE;
				} break;
			}
			return p;
		}
	}

	private BorderStyle borderStyle = BorderStyle.None;
	public BorderStyle BorderStyle {
		get {
			return this.borderStyle;
		}
		set {
			this.borderStyle = value;
			this.UpdateStyles();
		}
	}
}