Problems persisting property values of custom controls at design time!

[1 is a prime!]

Guys,

Hope someone can help me! I'm having real problems getting properties I type against a control I have written at design time.

I have written a control by inheriting from the Button control. I am trying to add a feature whereby the control changes to a different color when the mouse floats over it, or when the button has the focus. The color changing works if the 'LightColor' is set at runtime in code. However, if I draw the control on a form at design time, change the 'LightColor' property in the Property viewing window, save the form, then close and reopen the form, the property value (as seen in the window) goes back to the default value for the control. It's driving me mad, since I can't see what I've done wrong.

Here is the code for my control:

using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Windows.Forms;

namespace HCS.Components.Controls
{
	public class LightButton : Button
	{
		#region Fields

		private System.ComponentModel.Container components = null;
		private Color mBackColor;
		private Color mLightColor;
		private bool mIsMouseOver;

		#endregion

		#region Constructor

		public LightButton()
		{
			// This call is required by the Windows.Forms Form Designer.
			InitializeComponent();

			mBackColor = base.BackColor;
			mLightColor = base.BackColor;
		}

	
		#endregion

		#region Clean Up Code

		/// <summary> 
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if(components != null)
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#endregion

		#region Component Designer generated code
		/// <summary> 
		/// Required method for Designer support - do not modify 
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			components = new System.ComponentModel.Container();
		}
		#endregion

		#region Properties

		[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
		[DefaultValue(typeof(System.Drawing.Color), "System.Drawing.SystemColors.Window")]
		public new Color BackColor
		{
			get
			{
				return mBackColor;
			}
			set
			{
				mBackColor = value;
				SetColour();				
			}

		}

	
		[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
		[DefaultValue(typeof(bool), "true")]
		public new bool Enabled
		{
			get
			{
				return base.Enabled;
			}
			set
			{
				base.Enabled = value;
				SetColour();
			}
		}

		
		[DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
		[DefaultValue(typeof(System.Drawing.Color), "System.Drawing.SystemColors.Window")]
		public Color LightColor
		{
			get
			{
				return mLightColor;
			}
			set
			{
				mLightColor = value;
				SetColour();
			}
		}
		
		
		#endregion

		#region Protected Override Methods

		protected override void OnMouseEnter(EventArgs e)
		{
			base.OnMouseEnter (e);
			mIsMouseOver = true;
			SetColour();
		}
		
		
		protected override void OnMouseLeave(EventArgs e)
		{
			base.OnMouseLeave (e);
			mIsMouseOver = false;
			SetColour();
			
		}
		
		
		protected override void OnGotFocus(EventArgs e)
		{
			base.OnGotFocus (e);
			SetColour();
		}
		

		protected override void OnLostFocus(EventArgs e)
		{
			base.OnLostFocus (e);
			SetColour();
			
		}

	
		#endregion

		#region Private Methods

		private void SetColour()
		{
			if(mIsMouseOver || base.Focused)
			{
				base.BackColor = mLightColor;
			}
			else
			{
				base.BackColor = mBackColor;
			}
		}

	
		#endregion
	}
}

Please help - I'm going insane!

Thanks in advance,

Steve.

P.S. Really glad to see this site is still going!