Scrollowanie zawartości Boxa w Unity

Witam,napisałem prosty skrypt na czat i mam problem ze Scrollowaniem tekstu.
Próbowałem różncych metod. Próbowałem dodać Scrollbar,próbowałem skorzystać z metody GUILayout.BeginScrollView() ale nic nie działało prawidłowo. Chciałbym to zrobić bez zbytniego "niszczenia" poniższego skryptu:

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
public class Chat : MonoBehaviour 
{
	private List<string>ChatHistory = new List<string>();
	public GUISkin myskin;
	public float vSbarValue;
	private Rect windowRect = new Rect(0,Screen.height - 400, Screen.width, 400);
	private string messBox = "", messageToSend = "", user = "";
	private int ID;
	private Inventory MyInventory = new Inventory ();
	private PlayerSkin MyPlayerSkin = new PlayerSkin();
	private bool Send;
	private bool AdminMode;
	private Texture2D otherSkin;
	private Sprite mysprite;
	private bool ChatVisible;

	Vector2 scrollPosition = Vector2.zero;
	void Start()
	{
		user = PlayerEssentials.PlayerName;
		//otherSkin = Resources.Load<Texture2D> ("Skins/PlayerBase");
	}
	private void OnGUI()
	{
		GUI.skin = myskin;
		if (NetworkPeerType.Disconnected != Network.peerType && ChatVisible) 
		{
				windowRect = GUI.Window (1, windowRect, windowFunc, "", myskin.GetStyle ("ChatWindowStyle"));
		}
	}
	void Update()
	{
		if (Input.GetKeyDown (KeyCode.T)) //dodanie else sprawi jednorazowe działanie;
		{
			ChatVisible = !ChatVisible;
		}
	}
	[RPC]
	private void windowFunc(int id)
	{
		GUILayout.Box(messBox,GUILayout.Height(350));
		//vSbarValue = GUI.VerticalScrollbar(new Rect(Screen.width - 20, 5, 100, 350), vSbarValue, 1.0F, 10.0F, 0.0F);
		GUILayout.BeginHorizontal();
		messageToSend = GUILayout.TextField(messageToSend);
		GUILayout.EndVertical ();
		GUILayout.BeginVertical ();

		
		if (Input.GetKeyDown(KeyCode.T) || Input.GetKeyDown(KeyCode.F))
		{
			if(user != "") 
			{	
					networkView.RPC("SendMsg", RPCMode.All,"<color=#ff8400>" + "Emil nie mógł znaleźć tej komendy!" + "</color>" + "\n");
					messageToSend = "";
			}
			else
			{
					if(messageToSend != "")
					{
					networkView.RPC("SendMsg", RPCMode.All, user + ": " + "<color=#00a2ff>" + messageToSend + "</color>" + "\n");
					messageToSend = "";
					}
			}
			}

			if(messageToSend == "")
			{
				Send = false;
			}
			else
			{
				Send = true;
			} 
			ChatHistory.Add(messageToSend);
		}
		GUILayout.EndVertical();
	}
	[RPC]
	private void SendMsg(string mess)
	{
		messBox += mess;

	}
}