3d Object Dont Rotate With NGUI Camera

[amirivala]

Hi i have a UI Root(3d) and i also have a 3d object that i want to rotate it with Lerp, my object rotate perfectly with unity Camera but when i add NGUI 3d Camera, it stopped working and i know that my code is not working with NGUI, but is there a way to make it work?
(I KNOW NGUI HAS AN EXAMPLE THAT HAS ROTATE OBJECT BUT THAT DOSEN'T HAVE LERP)
Please help me I'm new to coding
thank you a lot
I Really appreciate it

Here is my code:

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class DragRotateSlowdown : MonoBehaviour {
5.        
6.         public float rotationSpeed = 10.0F;
7.         public float lerpSpeed = 1.0F;
8.        
9.         private Vector3 theSpeed;
10.         private Vector3 avgSpeed;
11.         private bool isDragging = false;
12.         private Vector3 targetSpeedX;
13.        
14.         void OnMouseDown() {
15.                
16.                 isDragging = true;
17.         }
18.        
19.         void Update() {
20.  
21.                
22.                 if (Input.touchCount > 0 && isDragging) {
23.                         theSpeed = new Vector3(-Input.touches[0].deltaPosition.x, Input.touches[0].deltaPosition.y, 0.0F);
24.                         avgSpeed = Vector3.Lerp(avgSpeed, theSpeed, Time.deltaTime * 5);
25.                 } else {
26.                         if (isDragging) {
27.                                 theSpeed = avgSpeed;
28.                                 isDragging = false;
29.                         }
30.                         float i = Time.deltaTime * lerpSpeed;
31.                         theSpeed = Vector3.Lerp(theSpeed, Vector3.zero, i);
32.                 }
33.                
34.                 transform.Rotate(Camera.main.transform.up * theSpeed.x * rotationSpeed, Space.World);
35.                 transform.Rotate(Camera.main.transform.right * theSpeed.y * rotationSpeed, Space.World);
36.         }
37. }

[ArenMook]

OnMouseDown is a Unity callback. NGUI's equivalent is OnPress(bool isPressed).