recognize if we click on a link

EduNetworkBuilder/Network.cs

@@ -501,6 +501,21 @@ namespace EduNetworkBuilder
             }
             return null;
         }
+
+        public NetworkLink LinkAtPosition(Point NetworkLocation)
+        {
+            NetworkLink tLink;
+            foreach (NetworkComponent tItem in NetComponents)
+            {
+                if (tItem is NetworkLink)
+                {
+                    tLink = (NetworkLink)tItem;
+                    if (tLink.AtLocation(NetworkLocation))
+                        return tLink;
+                }
+            }
+            return null;
+        }
         public List<NetworkDevice> DevicesInRectangle(Rectangle area)
         {
             NetworkDevice tDevice;