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		#region Response
		public override void ShowResponses (Subtitle subtitle, Response[] responses, float timeout)
		{
			base.ShowResponses(subtitle, responses, timeout);
			
			if(responses.Length > 0) 
				SetButtonsNav();
		}
		
		public override void HideResponses() 
		{
			dialogue.responseMenu.DestroyInstantiatedButtons();
			base.HideResponses();
		}
		
		void SetButtonsNav()
		{
			List<GameObject> buttons = dialogue.responseMenu.instantiatedButtons;
			int totals = buttons.Count;
			for(int i = 0; i < totals; i++)
			{
				Navigation n = new Navigation();
				n.mode = Navigation.Mode.Explicit;
				n.selectOnUp = (i == 0)? buttons[totals-1].GetComponent<Button>(): buttons[i-1].GetComponent<Button>();
				n.selectOnDown = (i == totals-1)? buttons[0].GetComponent<Button>(): buttons[i+1].GetComponent<Button>();
				buttons[i].GetComponent<Button>().navigation = n;
			}
			StartCoroutine(SetSelectedGameObject(buttons[0]));
		}

		IEnumerator SetSelectedGameObject(GameObject o)
		{
			//we need to wait to the next cicle :( otherwise we go into the same 
			//update how call the response and get the effect of autoselect.
			yield return null;
			UnityEngine.EventSystems.EventSystem.current.SetSelectedGameObject(o);
		}
		#endregion