Code generation for property 'yyy' failed:

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C#

Hi guys. I have a windows forms application that uses a User Control to draw some GDI+ shapes. But the thing is, the IDE keeps on displaying an error message that looks like
Code generation for property 'GetShapes' failed: Error was: Type 'SVGFormsApplication.MyShape' in Assembly 'SVGForms Application, Version 1.0.0.0, Culture = neutral, PublicKey Token= null' is not marked as Serializable.'

To make things clear, I am trying to create a list of MyShape objects within the User Control. Here is the source code

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Collections;

namespace SVGFormsApplication
{
  public partial class DrawingCanvas : UserControl
  {
    private List<MyShape> shapes;
    public DrawingCanvas()
    {
      InitializeComponent();
      shapes = new List<MyShape>(); 
    }
    protected override void OnPaint(PaintEventArgs e)
    {
      base.OnPaint(e);
    }

    public List<MyShape> GetSetShapes // my guess is this part is the culprit
   {
      get
      {
        return shapes;
      }
      set
      {
        shapes = value;
      }
    }

    private void DrawShapes(PaintEventArgs e)
    {
      foreach (MyShape shape in shapes)
      {
        shape.DrawShape(e);
      }
    }

  }
}

I don't personally want to Serialize anything but the error I am getting from the IDE seems to be related with Serialization.
Besides, I have tried to resolve the problem as follows but to no avail.

[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
public List<MyShape> GetSetShapes
{
    get
    {
        return shapes;
    }
    set
    {
        shapes = value;
    }
}

Thanks in advance for any reply.