Code

class MySvgNode : SvgNode
{
	public string MyProperty { get; set; }

	protected override DiagramItemProperties CreateProperties()
	{
		return new MySvgNodeProperties();
	}

	protected override void SaveProperties(DiagramItemProperties props)
	{
		base.SaveProperties(props);

		var myProps = (MySvgNodeProperties)props;
		myProps.MyProperty = MyProperty;
	}

	protected override void RestoreProperties(DiagramItemProperties props)
	{
		base.RestoreProperties(props);

		var myProps = (MySvgNodeProperties)props;
		MyProperty = myProps.MyProperty;
	}

	public override void Draw(MindFusion.Drawing.IGraphics graphics, RenderOptions options)
	{
		base.Draw(graphics, options);
		graphics.DrawString(MyProperty, Font, Brushes.Black, Bounds);
	}
}

class MySvgNodeProperties : SvgNodeProperties
{
	public string MyProperty { get; set; }
}