PropertyAttribute and PropertyDrawer doesn't work?!

Hello, i just followed this sample about the "Range" property in the manual http://docs.unity3d.com/Manual/editor-PropertyDrawers.html

Im very sure i have made it right, but in the inspector, it says "No GUI implemented" when i try to use a propertyattribute on a float value.

Below is my code and screenshots:

MyRangeAttribute.cs

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using System;
4.  
5.  
6. public class MyRangeAttribute : PropertyAttribute
7. {
8.     public float min;
9.     public float max;
10.  
11.     public MyRangeAttribute(float min, float max)
12.     {
13.         this.min = min;
14.         this.max = max;
15.     }
16. }

MyRangeDrawer.cs

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3. using UnityEditor;
4.  
5. [CustomPropertyDrawer(typeof(MyRangeAttribute))]
6. public class MyRangeDrawer : PropertyDrawer
7. {
8.     void OnGUI(Rect position, SerializedProperty property, GUIContent label)
9.     {
10.         MyRangeAttribute range = attribute as MyRangeAttribute;
11.         if (property.propertyType == SerializedPropertyType.Float)
12.             EditorGUI.Slider(position, property, range.min, range.max, label);
13.     }
14. }

MyTest.cs

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class MyTest : MonoBehaviour
5. {
6.     [MyRangeAttribute(0,20)] public float Hello;
7. }
8.  

I am using Unity version 5.0.1f1

 

Okay, i just figured out that you have to override OnGUI()

 

Not only override - public override:

Code (CSharp):

1. public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
2.     {
3.         MyRangeAttribute range = attribute as MyRangeAttribute;
4.         if (property.propertyType == SerializedPropertyType.Float)
5.             EditorGUI.Slider(position, property, range.min, range.max, label);
6.     }

You are overriding the implementation from the base class.