Cannot place a tree on top of a tree

EduNetworkBuilder/Network.cs

@@ -502,6 +502,23 @@ namespace EduNetworkBuilder
             return null;
         }
 
+        public bool BlockedByTree(Point NetworkLocation)
+        {
+            NetworkDevice tDevice;
+            foreach (NetworkComponent tItem in NetComponents)
+            {
+                if (tItem is NetworkDevice)
+                {
+                    tDevice = (NetworkDevice)tItem;
+                    if (tDevice.GetNetType() != NetworkComponentType.tree) continue; //We only care about trees
+                    Rectangle myRec = tDevice.GetMyRectangle();
+                    if (myRec.Contains(NetworkLocation))
+                        return true;
+                }
+            }
+            return false;
+        }
+
         public NetworkLink LinkAtPosition(Point NetworkLocation)
         {
             NetworkLink tLink;