Minor fix to allow serialization of network link and network device

EduNetworkBuilder/NetworkComponent.cs

@@ -8,10 +8,12 @@ using System.Runtime.Serialization.Formatters.Binary;
 using System.Runtime.Serialization;
 using System.IO;
 using System.Xml;
-
+using System.Xml.Serialization;
 
 namespace EduNetworkBuilder
 {
+    [XmlInclude(typeof(NetworkLink))]
+    [XmlInclude(typeof(NetworkDevice))]
     [Serializable]
     public class NetworkComponent
     {