/// <summary>
        /// Display the properties dialog
        /// </summary>
        public void ShowProperties(ImageOverlay ro)
        {
            if (properties != null)
            {
                properties.Dispose();
            }

            properties      = new ImageOverlayDialog(ro);
            properties.Icon = ParentApplication.Icon;
            properties.Show();
        }
		/// <summary>
		/// Display the properties dialog
		/// </summary>
		public void ShowProperties( ImageOverlay ro)
		{
			if(properties!=null)
				properties.Dispose();

			properties = new ImageOverlayDialog(ro);
			properties.Icon = ParentApplication.Icon;
			properties.Show();
		}