Once again, I couldn't find a built in control that provided what I wanted for property editing, so I've implemented the above property grid manually.

I'm drawing the lines and text with GDI+ methods, then moving a borderless TextBox over the selected value. When the selection changes, the relevant property is validated and updated. Works really well.

The PropertyForm actually owns a list of MapItemProperties, which can have either a Number or Text type. The idea is that the same form can be used to edit the properties of different sorts of items.

I just add values to the PropertyForm's List and update it. Plan is to have a delegate callback that is called when a value is succesfully updated so I can then manually update whatever is being edited.

In theory, I should even be able to select multiple items (once they are implemented) and have the property form show the common items for all of them.

Pretty cool really. I must learn how to turn these into reusable components at some point.

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

namespace WindowsApplication1
{
	public partial class Form1 : Form
	{
		class Object
		{
			public String Name;
			public Point Location;

			public Object(String Name, Point Location)
			{
				this.Name = Name;
				this.Location = Location;
			}

			[DisplayName("Object Name")]
			public String ObjName
			{
				get
				{
					return Name;
				}

				set
				{
					Name = value;
				}
			}

			[DisplayName("Object Location")]
			public Point ObjLocation
			{
				get
				{
					return Location;
				}

				set
				{
					Location = value;
				}
			}
		};

		Object MyObject = new Object("Donny", new Point(10, 10));

		public Form1()
		{
			InitializeComponent();

			propertyGrid1.Select();
			propertyGrid1.SelectedObject = MyObject;
		}
	}
}

item 10 "Block"
    X=0 Y=0 Width=64 Height=64 Attribute=8 end
    image "block.bmp"