My OnGUI() Won't show the Button elements :(

This is my entire code, i put into my Texture2D varaibles a Sprite elements (each button has a PNG sprite).... When i press play, nothing happens, the buttons won't appear. please help!

using UnityEngine; using System.Collections; using UnityEngine.UI; // Is this needed? =O [ExecuteInEditMode]

public class MainMenuUIControllerScript : MonoBehaviour {

 public Texture2D playButtonTexture;
 public Texture2D highscoreButtonTexture;
 public Texture2D optionsButtonTexture;
 public Texture2D quitButtonTexture;
 public Texture2D musicOnButtonTexture;
 public Texture2D musicOffButtonTexture;

 public float playButtonOffSetX;
 public float playButtonOffSetY;
 public float highscoreButtonOffSetX;
 public float highscoreButtonOffSetY;
 public float optionsButtonOffSetX;
 public float optionsButtonOffSetY;
 public float quitButtonOffSetX;
 public float quitButtonOffSetY;
 public float musicOnButtonOffSetX;
 public float musicOnButtonOffSetY;
 public float musicOffButtonOffSetX;
 public float musicOffButtonOffSetY;

 public int setNativeWidth;
 public int setNativeHeight;

 public GUIStyle style;

 public bool isMusicOn;


 // Use this for initialization
 void Start () {
 
     isMusicOn = false;

 }
 
 // Update is called once per frame
 void Update () {

 }

 void OnGUI ()
 {

     AutoResize (setNativeWidth, setNativeHeight);

     if (GUI.Button (new Rect (playButtonOffSetX, playButtonOffSetY, playButtonTexture.width, playButtonTexture.height), playButtonTexture)) 
     {

         Debug.Log ("You pressed Start");

     }

     if (GUI.Button (new Rect (highscoreButtonOffSetX, highscoreButtonOffSetY, highscoreButtonTexture.width, highscoreButtonTexture.height), highscoreButtonTexture, style)) {

         Debug.Log ("You pressed highScore");

     }

     if (GUI.Button (new Rect (optionsButtonOffSetX, optionsButtonOffSetY, optionsButtonTexture.width, optionsButtonTexture.height), optionsButtonTexture, style)) {

         Debug.Log ("You pressed Options");

     }

     if (GUI.Button (new Rect (quitButtonOffSetX, quitButtonOffSetY, quitButtonTexture.height, quitButtonTexture.width), quitButtonTexture, style)) {

         Debug.Log ("You pressed quit");

     }

// if (isMusicOn == true) { // // if ( GUI.Button (new Rect ( musicOnButtonOffSetX, musicOnButtonOffSetY, musicOnButtonTexture.height, musicOnButtonTexture.width), musicOnButtonTexture, style)) // isMusicOn = false; // { // // Debug.Log ("You pressed On Button, to turn off sound"); // // } // // } // // if (isMusicOn == false) { // // if (GUI.Button (new Rect( musicOffButtonOffSetX, musicOffButtonOffSetY, musicOffButtonTexture.height, musicOffButtonTexture.width),musicOffButtonTexture, style)) // isMusicOn = true; // { // // Debug.Log ("You pressed Off Button, to turn on sound"); // // } // // }

 }

 public void AutoResize (int nativeWidth, int nativeHeight)
 {
     Vector2 aspectRatio = new Vector2 ((float)Screen.width / nativeWidth, (float)Screen.height / nativeHeight);
     GUI.matrix = Matrix4x4.TRS (Vector3.zero,Quaternion.identity,new Vector3(aspectRatio.x, aspectRatio.y, 1.0f));
 }

}