UGUI的下拉菜单

using UnityEngine;using UnityEngine.UI;using System.Collections;public class btuchufa : MonoBehaviour {    // Use this for initialization    void Start () {}// Update is called once per framevoid Update () {}    /// <summary>    /// ONMOUSEENTERPROLIS the specified obj.    /// </summary>    /// <param name="obj">Object.</param>    public void ProList(GameObject obj)    {        if (obj.activeSelf == false)        {            obj.SetActive(true);        }        else        {            obj.SetActive(false);        }    }}