EventTrigger PointerEnter

Hi Guys, I have problem with Pointer Event Trigger - Pointer Enter. I have created from script Text, i want to change text color when I touch it with the mouse. But when I touch it function OnPointerEnter was not called. Only when I click on the text it's change color..

 using UnityEngine;
 using UnityEngine.UI;
 using UnityEngine.Events;
 using UnityEngine.EventSystems;
 using System.Collections;
 using System.Collections.Generic;
 
 public class ComboBoxText : MonoBehaviour
 {
     public GameObject _current;
 
     public GameObject _go;
     public RectTransform _rt;
     public Text _text;
     public EventTrigger _et;
     public EventTrigger.TriggerEvent _trig;
     public EventTrigger.Entry _entry;
 
     public ComboBoxText(GameObject _current, Font _font, int _fontSize)
     {
 
         _go = new GameObject();
         _go.name = "Tested GameObject";
         _go.transform.parent = _current.transform;
 
         _go.AddComponent<RectTransform>();
         _rt = _go.GetComponent<RectTransform>();
         _rt.anchoredPosition3D = new Vector3(0f, 0f, 0f);
         _rt.pivot = new Vector2(0f, 1f);
         _rt.sizeDelta = new Vector2(130, 30);
         _rt.localPosition = new Vector3(0f, 0f, 0f);
         _rt.localScale = new Vector3(1f, 1f, 1f);
         _rt.anchoredPosition3D = new Vector3(0f, 0f, 0f);
         _rt.pivot = new Vector2(0f, 1f);
         _rt.localScale = new Vector3(1f, 1f, 1f);
 
         _go.AddComponent<Text>();
         _text = _go.GetComponent<Text>();
         _text.text = "TestText";
         _text.font = _font;
         _text.fontSize = _fontSize;
         _text.color = new Color32(200, 200, 200, 255);
         _text.alignment = TextAnchor.MiddleLeft;
 
         _et = _go.GetComponent<EventTrigger>();
         if (_et == null) { _et = _go.AddComponent<EventTrigger>(); }
         _trig = new EventTrigger.TriggerEvent();
         _trig.AddListener((data) => OnPointerEnter());
         _entry = new EventTrigger.Entry() { callback = _trig, eventID = EventTriggerType.PointerEnter };
         _et.delegates = new List<EventTrigger.Entry>();
         _et.delegates.Add(_entry);
     }
 
     public void OnPointerEnter()
     {
         Debug.Log("OnPointerEnter");
         _text.color = new Color32(200, 200, 200, 255);
     }
 }

Creating was called from another script:

 using UnityEngine;
 using UnityEngine.UI;
 using UnityEngine.Events;
 using UnityEngine.EventSystems;
 using System.Collections;
 using System.Collections.Generic;
 
 public class UI_ComboBox :
 {
     public GameObject _go;
     public Font _font;
     public int _fontSize;
 
     private RectTransform _rt;
     private ComboBoxText _mainText;    
 private uint _CurrentItemNum = 0;
 
     void Start () {
         _rt =  _go.GetComponent<RectTransform>();
 
         _mainText = new ComboBoxText(_go, _font, _fontSize);
         _mainText._go.name = _go.name + "_MainText";
         _mainText._rt.sizeDelta = new Vector2(_rt.sizeDelta.x, _rt.sizeDelta.y);
         _mainText._rt.anchoredPosition3D = new Vector3(0f, 0f, 0f);
         _mainText._text.text = " MainText";
     
     }   
 }