[CustomDocumentEvents]
public partial class CMSModuleLoader
{
	/// <summary>
	/// Attribute class that ensures the loading of custom handlers
	/// </summary>
	private class CustomDocumentEventsAttribute : CMSLoaderAttribute
	{
		/// <summary>
		/// Called automatically when the application starts
		/// </summary>
		public override void Init()
		{
			DocumentEvents.Update.After += Document_Update_After;
		}
	
				private void Document_Update_After(object sender, DocumentEventArgs e)
		{
			UpdateDocumentName(e.Node);
		}

		private void UpdateDocumentName(TreeNode node)
		{
			if (node != null)
			{
				if (node.NodeClassName.Equals("aa.GalleryImage"))
				{
					var imageGuid = ValidationHelper.GetGuid(node.GetValue("ImageSrc"), Guid.Empty);
					if (imageGuid == Guid.Empty) return;
					
					var am = new AttachmentManager();
					var attachment = am.GetAttachmentInfo(imageGuid, CMSContext.CurrentSiteName);
					if (attachment == null) return;
					node.DocumentName = attachment.AttachmentName;
					node.Update();
					
				}
			}
		}
	}
}