Swipe to place order in ShopScrollList (prefabs, object pooling, instantiating)

I am building an Augmented Reality Food Project. I am trying to swipe the 3D object(food) to the Shop list for make the order of the food. Then, it should display the prefab for the object. The problem is I can't create new prefab at the second swipe of other 3D object. I mean that once I swipe one 3D Object, it should create one prefab in list and swipe other 3D Object, it also should create one more prefab on the same list. But how?

I follow the sample tutorials HERE

This swipe.cs script is attached to each 3D objects

Swipe.cs

 public Transform player; // Drag your player here
 public ShopScrollList shoplist;
 
 void Update ()
 {
         foreach(Touch touch in Input.touches)
         {
             if (touch.phase == TouchPhase.Began)
             {
                 fp = touch.position;
                 lp = touch.position;
             }
             if (touch.phase == TouchPhase.Moved )
             {
                 lp = touch.position;
                 swipeDistanceX = Mathf.Abs((lp.x-fp.x));
                 swipeDistanceY = Mathf.Abs((lp.y-fp.y));
             }
             if(touch.phase == TouchPhase.Ended)
             {
                 angle = Mathf.Atan2((lp.x-fp.x),(lp.y-fp.y))*57.2957795f;
                 if(angle > -30 && angle < 30 && swipeDistanceY > 40)
                 {
                     Debug.Log ("swipe");
                     player.position += new Vector3 (0, 0, 200);
                     if (player.name == "cupcake") {
                         shoplist.RefreshDisplay (player.name);
                     }
                     if (player.name == "friedegg") {
                         shoplist.RefreshDisplay (player.name);
                     }
                 }  

This ShopScrollList.cs is attached to the content panel

ShopScrollList.cs

 [System.Serializable]
 public class Item {
     public string itemName;
     public Sprite icon;
     public string price = 2 + "$";
 }
 
 public class ShopScrollList : MonoBehaviour {
 
     public List<Item> itemList;
     public Transform contentPanel;
     public Text myGoldDisplay;
     public SimpleObjectPool buttonObjectPool;
     private GameObject newButton;
 
 public void RefreshDisplay(string name)
 {
 RemoveButton();
 AddButton (name);
 }
 
 public void AddButton(string name){
 if (name == "cupcake") {
 
                 Item item = itemList [0];
                 GameObject newButton = buttonObjectPool.GetObject ();  // get object from pool
                 newButton.transform.SetParent (contentPanel);
                 SampleButton samplebutton = newButton.GetComponent<SampleButton> ();
                 samplebutton.Setup (item, this); // this refer to this scrolllist
         }
         if (name == "friedegg") {
 
                 Item item = itemList [1];
                 GameObject newButton = buttonObjectPool.GetObject ();  // get object from pool
                 newButton.transform.SetParent (contentPanel);
                 SampleButton samplebutton = newButton.GetComponent<SampleButton> ();
                     samplebutton.Setup (item, this); // this refer to this scrolllist
 
 
         }
 }
 
 private void RemoveButton(){
         while (contentPanel.childCount > 0) {
 
             GameObject toRemove = transform.GetChild (0).gameObject; // as long as there still has child game object there always be child zero, remove
             buttonObjectPool.ReturnObject(toRemove);
             Debug.Log ("What num" + toRemove);
         }
     }
 
 public void TryTransferItemToOtherShop (Item item){
 RemoveItem (item, this); // current
         RefreshDisplay();
 }
     private void RemoveItem( Item itemToRemove, ShopScrollList shopList){
         Debug.Log ("Shoplist777" + shopList.itemList.Count);
         Debug.Log("itemremove88" + itemToRemove.itemName);
         for (int i = shopList.itemList.Count -1; i >=0; i--) {
             if (shopList.itemList [i] == itemToRemove) {
                 shopList.itemList.RemoveAt (i);
                 Debug.Log ("remove list" + itemToRemove.itemName);
                 Debug.Log ("number" + i);
 
             }
 
         }
     }
 }

This SampleButton.cs is the prefab that is called from shopScrollList.cs

SampleButton.cs

 public Button button;
     public Text nameLabel;
     public Text priceLabel;
     public Image iconImage;
     // Use this for initialization
     private Item item;
     private ShopScrollList scrollList;
 
 public void Setup(Item currentItem, ShopScrollList currentShopList){
 
         item = currentItem;
         nameLabel.text = item.itemName;
         priceLabel.text = item.price;
         iconImage.sprite = item.icon;
 
         scrollList = currentShopList;
 
 }

I want to have more than one prefabs appear on the same Shop UI list once I swipe continuously with 3D objects.