Dynamical prefab, how to instantiate + positioning

Hey guys, I got a problem:

I'm doing a toggle field which will look like this:

My hierarchy is the following: Menu > (1)Panel > (2)Panel > Gameobject > Toggle > BG, Label

I got a prefabToggle and I positioned it both, outside and inside of the viewport / scene.

(2)Panel has a script:

 using UnityEngine;
 using UnityEngine.UI;
 using System.Collections;
 
 
 public class Chooser : MonoBehaviour
 {
     public GameObject MyButtonPrefab;  //GameObject of PrefToggle is set here
     public RectTransform ParentPanel;  //(2)Panel
     // Use this for initialization
     void Start ()
     {
         GameObject newButton = (GameObject)Instantiate(MyButtonPrefab);
         newButton.transform.SetParent(ParentPanel, true);
         newButton.transform.localScale = new Vector3(1, 1, 1);
         newButton.transform.parent = Camera.main.transform;
         newButton.transform.position = new Vector3(0, 0, 0);
         newButton.name = "Test";
         newButton.GetComponentInChildren<Text>().text = "Test";
 
         //Test1:
         newButton.transform.parent = Camera.main.transform;
         newButton.transform.position = new Vector3(0, 0, 0);
 
         GameObject newButton2 = (GameObject)Instantiate(MyButtonPrefab);
         newButton2.transform.SetParent(ParentPanel, true);
         newButton2.transform.position = new Vector3(0, 40, 0);
         newButton2.transform.localScale = new Vector3(1, 1, 1);
         newButton2.name = "Test2";
         newButton2.GetComponentInChildren<Text>().text = "Test2";
 
 
     }
 }

But unfortunately, the toggles created are not being shown in my panel. I tried it with Vertical Layout Group, which showed the toggles but their positioning was wrong on the one hand and dependant on the prefab Button, which leads to not showing the buttons again if I dragged it out of the scene, on the other hand. And is it possible to solute the image given with the Grid Layout Group, or would one has to set up a 4x4 field and e.g. T2 can't take 0 - [0][3], three "gridfields" ?