function OnGUI () {
GUILayout.BeginHorizontal ("box");

GUILayout.Button ("I'm the first button");
GUILayout.Button ("I'm to the right");

// End the horizontal group we began above
GUILayout.EndHorizontal ();
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
void OnGUI() {
GUILayout.BeginHorizontal("box");
GUILayout.Button("I'm the first button");
GUILayout.Button("I'm to the right");
GUILayout.EndHorizontal();
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

def OnGUI():
GUILayout.BeginHorizontal('box')
GUILayout.Button('I\'m the first button')
GUILayout.Button('I\'m to the right')
GUILayout.EndHorizontal()