GUI.Label background not working since 4.5 upgrade

Since I upgraded Unity 4.5 I don't see background texture for the code

 var texture = new Texture2D(1, 1, TextureFormat.RGBA32, false);
 texture.SetPixel(0, 0, new Color(0.3f, 0.3f, 0.3f, 0.5f));
 texture.Apply();
 
 _style = new GUIStyle { fontSize = 12, normal = new GUIStyleState { textColor = Color.green, background = texture } };
 _position = new Rect(10, 10, 100, 100);
 
 
 void OnGUI()
 {
     if(Event.current.type != EventType.Repaint) return;
     GUI.depth = 0;
     GUI.Label(_position, _content.text, _style);
 
 }

What might be wrong?