(C#) GUI Buttons not working

I am trying to make a main menu from the built in GUI system.This is my first time doing this so I do not know that much about them. But anyways here is my problem.When I press the buttons they do not say that they have been clicked.

Here is my script.

 using UnityEngine;
 using System.Collections;
 
 [ExecuteInEditMode]//Be seen in edit mode
 
 public class MainMenu : MonoBehaviour
 {
     //Variables Start
 
     //Private Variables
     private bool ShowMainMenu = false;
     private bool ShowSinglePlayer = false;
     private bool ShowMultiPlayer = false;
     private bool ShowOptions = false;
     private bool ShowCredits = false;
     private bool ShowSettings = false;
     private bool ShowContollerSettings = false;
     private bool ShowGraphicalSettings = false;
     private bool ShowExit = false;
 
 
     //Variables To make it in the middle
     public Rect WindowPosition = new Rect(20,20, 120, 50);
     public bool CenterWindow = true;
     private Rect CurrentRect =  new Rect(20,20, 120, 50);
     
 
     //Varioables End
 
 
     void Start()
     {
         CurrentRect = WindowPosition;
     }
 
     void OnGUI()
     {
         CenterWindow = true;
         ShowMainMenu = true;
 
         if(CenterWindow)
         {
             CurrentRect.x = (Screen.width * 0.5f) - (CurrentRect.width * 0.5f);
             CurrentRect.y = (Screen.height * 0.5f) - (CurrentRect.height * 0.5f);
         }
 
         if(ShowMainMenu)
         {
             CurrentRect = GUILayout.Window(0, CurrentRect, MainMenuWindow, "Main Menu",GUILayout.MinHeight(Screen.height * 0.25f),GUILayout.MinWidth(Screen.width * 0.25f));
         }
     }
 
     void MainMenuWindow(int windowID)
     {
         GUILayout.BeginVertical();
             if(GUILayout.Button("Singleplayer"));
 
             print("You are now in the singleplayer Window");
         
                 GUILayout.Space(2);
             if(GUILayout.Button("Multiplayer"));
 
             print("You are now in the Multiplayer Window");
         
                 GUILayout.Space(2);
             if(GUILayout.Button("Options"));
                 GUILayout.Space(2);
             if(GUILayout.Button("Credits"));
                 GUILayout.Space(2);
             if(GUILayout.Button("About Us"));
                 GUILayout.Space(2);
             if(GUILayout.Button("Quit"));
         GUILayout.EndVertical();
 
     }

I do not get any errors.The buttons say that they are clicked right when you press play. Please help me with this I am stuck.

Thanks Infinite Gamer