using System.Windows.Forms;
using System.Windows.Forms.Design;
using System.ComponentModel.Design;
using System.ComponentModel;
using System.Drawing;

// System.Design.dll の参照が必要です。
// ClientProfile では追加できないので注意してください。

namespace WindowsFormsApplication1
{
    [Designer(typeof(MyControlDesigner))]
    public class MyControl : FlowLayoutPanel
    {
        public MyControl()
        {
            this.Size = new Size(300, 200);

            this.ChildPanel = new ChildPanel();
            this.ChildPanel.Size = new Size(100, 100);
            this.Controls.Add(this.ChildPanel);
        }

        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        public ChildPanel ChildPanel { get; internal set; }
    }
    internal class MyControlDesigner : ParentControlDesigner
    {
        public override void Initialize(IComponent component)
        {
            base.Initialize(component);
            MyControl myControl = (MyControl)component;
            this.EnableDesignMode(myControl.ChildPanel, "ChildPanel");
        }
        protected override void OnPaintAdornments(PaintEventArgs pe)
        {
            base.OnPaintAdornments(pe);
            Rectangle rect = this.Control.ClientRectangle;
            rect.Inflate(-1, -1);
            using (Pen pen = new Pen(Color.Gray))
            {
                pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;
                pe.Graphics.DrawRectangle(pen, rect);
            }
        }
    }

    [ToolboxItem(false)]
    [Designer(typeof(ChildPanelDesigner))]
    public class ChildPanel : FlowLayoutPanel { }

    public class ChildPanelDesigner : ParentControlDesigner
    {
        public override SelectionRules SelectionRules
        {
            get
            {
                return base.SelectionRules & ~SelectionRules.Moveable;
            }
        }

        protected override void OnPaintAdornments(PaintEventArgs pe)
        {
            base.OnPaintAdornments(pe);
            Rectangle rect = this.Control.ClientRectangle;
            rect.Inflate(-1, -1);
            using (Pen pen = new Pen(Color.Gray))
            {
                pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;
                pe.Graphics.DrawRectangle(pen, rect);
            }
        }
        public override bool CanBeParentedTo(IDesigner parentDesigner)
        {
            return (parentDesigner is MyControlDesigner);
        }
    }
}