make refresh the collider in NGUI widgets a little bit easier

UIToolExtension.cs

using UnityEngine;
using UnityEditor;
using System.Collections;

static public class UIToolExtension{

    //add this to NGUImenu.cs
    [MenuItem("NGUI/Refresh a Collider #&r")]
    static public void RefreshCollider() {
        GameObject go = Selection.activeGameObject;

        if (NGUIEditorTools.WillLosePrefab(go)) {
            if (go != null) {
                NGUIEditorTools.RegisterUndo("Refresh Widget Collider", go);
                Collider col = go.GetComponent<Collider>();
                if (col != null) {
                    DestroyObj.DestroyImmediate(col);
                }
                NGUITools.AddWidgetCollider(go);
            }
            else {
                Debug.Log("You must select a game object first, such as your button.");
            }
        }
    }

}