No Touch Button

Heyy
I’m developing an app to use with Google Cardboard. It’s almost done, but there’s one thing that I can’t solve: How to make the button activated without clicking in it? I did a loading bar that starts when I put the target in the button, but it loads and then nothing happens, altought I have a script in it that changes the scene. When I click it, the script is activated and the scene is changed.

Here’s my script

using UnityEngine;
using System.Collections;

public class ChangeScene : MonoBehaviour {

public void ChangeToScene (string sceneToChangeTo) {
Application.LoadLevel(sceneToChangeTo);

}
}