A quick snippet of a Unity Custom Editor

PageInspector.cs

using UnityEngine;
using UnityEditor;
using System.Collections;
using System.Collections.Generic;
 
[CustomEditor(typeof(Page))]
public class PageInspector : Editor {
 
    public Material wordMat = null;
 
    public override void OnInspectorGUI()
    {
        base.OnInspectorGUI();
       
        GUILayout.BeginVertical();
        {
            wordMat = EditorGUILayout.ObjectField(wordMat, typeof(Material), true ) as Material;
            GUILayout.Space(10f);
           
            GUILayout.BeginHorizontal();
            if( GUILayout.Button("Create Words") )
            {
                // create the text objects with the textures list.
                CreatePage( target );
            }
            GUILayout.FlexibleSpace();
            if (GUILayout.Button("NOT IMPLEMENTED") )
            {
                // add the page image.
            }
            GUILayout.EndHorizontal();
        }
        GUILayout.EndVertical();
       
       
        if(GUI.changed)
            EditorUtility.SetDirty(target);
    }
}