GUI Button Not Displaying?

Hey guys the GUI Buttons are not Displaying in the currently creating a Test Game, I am a current Newbie at using Unity and a C#, C++ Programmer whois just learning the Documentation. Here is the Code in C#

 using UnityEngine;
 using System.Collections;
 
 
 public class Pause_Menu : MonoBehaviour
 {
     bool paused = false;
 
     void Update()
     {
         if (Input.GetButtonDown("Pause"))
         {
             if (!paused)
             {
                 Time.timeScale = 0;
                 paused = true;
             }
             else
             {
                 Time.timeScale = 1;
                 paused = false;
                 OnGui();
             }
         }
 
     }
 
     void OnGui()
     {
         if (paused)
         {
             if (GUI.Button(new Rect(10, 50, 100, 30), "Resume"))
             {
                 Time.timeScale = 1.0f;
                 paused = false;
             }
             if (GUI.Button(new Rect(10, 90, 100, 30), "options"))
             {
             }
             if (GUI.Button(new Rect(10, 130, 100, 30), "Quit"))
             {
             }
         }
     }
 }

The Game Pauses Correctly the Buttons are not showing up when I it Pauses though