GUILayout.EndArea  

function OnGUI () {
    GUILayout.BeginArea (Rect (10,10,100,100));
    GUILayout.Button ("Click me");
    GUILayout.Button ("Or me");
    // Ends the area started above
    GUILayout.EndArea ();
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    void OnGUI() {
        GUILayout.BeginArea(new Rect(10, 10, 100, 100));
        GUILayout.Button("Click me");
        GUILayout.Button("Or me");
        GUILayout.EndArea();
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    def OnGUI():
        GUILayout.BeginArea(Rect(10, 10, 100, 100))
        GUILayout.Button('Click me')
        GUILayout.Button('Or me')
        GUILayout.EndArea()