Augmented Reality Tutorial for Beginner 5: User Interface(UI) AR model with Unity3D and Vuforia

This video is to teach you how to use UI to control the model using Unity 3D and Vuforia.
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Source code:
public float scalingspeed = 0.01f;
bool ScaleUp = false;
bool ScaleDown = false;

// Update is called once per frame
void Update () {
if (ScaleUp == true)
ScaleUpButton();
if (ScaleDown == true)
ScaleDownButton();
}

public void ScaleUpButton()
{
GameObject.FindWithTag("Boy").transform.localScale += new Vector3(scalingspeed, scalingspeed, scalingspeed);
}
public void ScaleDownButton()
{
GameObject.FindWithTag("Boy").transform.localScale += new Vector3(-scalingspeed, -scalingspeed, -scalingspeed);
}

public void Up()
{
ScaleUp = true;
ScaleDown = false;
}
public void Down()
{
ScaleUp = false;
ScaleDown = true;
}
public void Stop()
{
ScaleUp = false;
ScaleDown = false;
}