using UnityEngine;
using UnityEditor;
using System;

public class MyAssetEditor {
    [MenuItem("Assets/Create/MyAsset")]
    public static void CreateMyAsset()
    {
        MyAsset asset = (MyAsset)ScriptableObject.CreateInstance("MyAsset");  //scriptable object
        AssetUtility.CreateAsset(asset, "New MyAsset");
        AssetUtility.SaveAsset(asset);
        EditorUtility.FocusProjectWindow();
        Selection.activeObject = asset;
    }
}

public class MyAsset : ScriptableObject {
    public int i;
}