ModelProject/Assets/Test/TestMyButton.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class TestMyButton : MonoBehaviour
{
    public MyButton myButton;
    // Start is called before the first frame update
    void Start()
    {
        myButton.onClick.AddListener(()=> {Debug.Log(" myButton.onClick");});
        myButton.OnDoubleClick.AddListener(() => {Debug.Log(" myButton.OnDoubleClick");});
        myButton.OnLongPress.AddListener(() => {Debug.Log(" myButton.OnLongPress");});}
    // Update is called once per frame
    void Update(){}
}