create a button with name and text for every game object with tag

I have 10 game objects called "marker1" through "marker10". For each of these game objects i want to create a button whose name and text is the same as the name of the game object.

I have the following code so far

 public class buttongenerator : Monobehaviour {
 
       public GameObject buttonprefab;
       public GameObject scrollbox;
 
 void Start () {
       GameObject [] markerlist = GameObject.FindGameObjectsWithTag ("Marker");
       var markername = gameObject.transform.name;
       for (var i = 0; i < markerlist.Length; i++) {
            GameObject newbutton = Instantiate (buttonprefab) as GameObject;
            newbutton.transform.SetParent (scrollbox.transform);

   //All the code works up to here. My problem is renaming the buttons and changing the text to be the name of the marker.

I have tried using newbutton.guiText = markername [i] and newbutton.name = markername [i] but it doesn't change the name or text of the generated buttons.

Any ideas?