public override void OnInspectorGUI()
 {
     DrawDefaultInspector();
     if (GUILayout.Button("Set workers"))
     {
         List <Image> workerImages = new List <Image>();
         Transform    holder       = waveSpawnerScript.GetUiWorkersHolder();
         if (holder)
         {
             for (int i = 0; i < holder.childCount; i++)
             {
                 Image workerImage = holder.GetChild(i).GetComponent <Image>();
                 workerImages.Add(workerImage);
                 EditorUtility.SetDirty(workerImage);
             }
         }
         waveSpawnerScript.SetWorkerImages(workerImages);
         Debug.LogWarning("Successfully set workers, don't forget to save!");
     }
 }