Unity customize hierarchy window

using UnityEditor;
using UnityEngine;
[InitializeOnLoad]
public class CustomHierarchy : MonoBehaviour
    static CustomHierarchy()
    {
        EditorApplication.hierarchyWindowItemOnGUI += HandleHierarchyWindowItemOnGUI;
    }
    private static void HandleHierarchyWindowItemOnGUI(int instanceID, Rect selectionRect)
    {
		//code to edit the hierarchy here        
    }
}

Source: yarnthen.github.io

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