Set value to children under target node

SetValueToChildren.cs

using UnityEngine;
using System.Collections;

public class SetValueToChildren : MonoBehaviour {

	// Use this for initialization
	void Start () {
	
	}
	
	// Update is called once per frame
	void Update () {
	
	}
}

SetValueToChildrenEditor.cs

using UnityEngine;
using System.Collections;
using UnityEditor;

[CustomEditor(typeof(SetValueToChildren))]
public class SetValueToChildrenEditor : Editor
{
    void setValueToMaterial( GameObject go)
    {
        Debug.Log(go.name);
        Renderer renderer = go.GetComponent<Renderer>();
        if (renderer != null)
        {
            Debug.Log(go.name);
            renderer.sharedMaterial.SetFloat("valueName", 0.0f);
        }

        for (int i = 0; i < go.transform.childCount; i++)
        {
            Transform t = go.transform.GetChild(i);
            setLineWidthToMaterial(t.gameObject);
        }
    }

    public override void OnInspectorGUI()
    {
        if (GUILayout.Button("SetValue", GUILayout.Width(100f)))
        {
            SetValueToChildren myTarget = (SetValueToChildrenEditor)target;
            setValueToMaterial(myTarget.gameObject);
        }
    }
}