Project/Assets/Scripts/SceneRoot/Editor/RunFromMain.cs

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//
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using UnityEngine;
using UnityEditor;
using System.Collections;
using System.IO;

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//
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namespace ReaderRabbit
{

	//================================================================================
	//
	//================================================================================
	public class RunFromMain : EditorWindow
	{
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		//
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		[MenuItem ("Run/Run from first scene _%#r")]
		static void Run()
		{
			if (!EditorApplication.isPlaying)
			{
				EditorApplication.SaveScene();

				string currentSceneName = EditorApplication.currentScene;
				File.WriteAllText(".lastScene", currentSceneName);
	 
				EditorApplication.OpenScene("Assets/Scenes/_Dummy.unity");
				EditorApplication.isPlaying = true;
			}
			else
			{
				string lastScene = File.ReadAllText(".lastScene");
				EditorApplication.isPlaying = false;
				EditorApplication.OpenScene(lastScene);
			}
		}
		
    } // public class RunFromMain : EditorWindow
	
} // namespace ReaderRabbit