Accessing tiles in another class

Greetings,

My apologies if this question has been asked before. I've searched far and wide, and even though I do find answers, I either don't understand or they don't give me the answer that I need.

I'm keeping a grid of tiles that I am trying to refer back to, after creation. My first step, is this :

 using UnityEngine;
 using System.Collections;
 
 public class copyPlane : MonoBehaviour {
     public Transform  myPrefab;
     public int width;
     public int height;
     public float tileWidth;
     public float tileHeight;
     public float tileGap;
     public Vector3 startLocation;
     public TileList tiles;
     // Use this for initialization
     void Start () {
         for (int iX = 0; iX< width; iX++) 
         {
             for(int iY = 0; iY < height; iY++)
             {
                 Vector3 loc = new Vector3();
                 loc.x = startLocation.x + ((tileWidth + tileGap) * iX);
                 loc.z = startLocation.z + ((tileHeight + tileGap) * iY);
                 loc.y = startLocation.y;
                 Object nPrefab = Instantiate (myPrefab, loc, myPrefab.rotation);
                 nPrefab.name = "tile_" + iX.ToString () + ";" + iY.ToString ();
                 tiles.AddTile (iX, iY, loc);
             }
         }
 
         //Object nPrefab = Instantiate (myPrefab, new Vector3(6,1,20), myPrefab.rotation);
 
     }
     
     // Update is called once per frame
     void Update () {
 
     }
 }

That works fine. Note the " public TileList tiles;". Then, in order to keep track of my tiles, I created this class :

  using UnityEngine;
     using System.Collections;
     using System.Collections.Generic;
     
     public  class TileList {
     
     
     
         public List<TileElement> tiles;
         // Use this for initialization
         void Start () 
         {
             tiles = new List<TileElement> ();
         }
     
         public void AddTile(int x, int y, Vector3 location)
         {
             TileElement newTile = new TileElement (location, x, y);
             tiles.Add (newTile);
         }
         // Update is called once per frame
         void Update () {
         
         }
     }
     
     public class TileElement
     {
         public Vector3 location;
         public int x;
         public int y;
         
         public TileElement(Vector3 _location, int _x, int _y)
         {
             location = _location;
             x = _x;
             y = _y;
         }
     }

Super. Now that all populates on launch, and it makes me happy. However, now that I do have that list populates, and I want to move another object to tile X;Y ... How do I refer back to that list? I can't seem to access that class, as I would normally do in C#.

I think my biggest problem here is that I'm still thinking in normal c# terms, and don't have my mind wrapped around the Unity environment/concept.

Any help, pointers, death threats or girlfriend telephone numbers are welcome.

Regards, Maerdyn

EDIT : Properly encapsulated [code][/code]