I am working on a program where each item can hold an array of items (i'm making a menu, which has a tree-like structure)

currently i have the items as a list, instead of an array, but I don't feel like I'm using it to its full potential to simplify code. I chose a list over a standard array because the interface (.add, .remove, etc...) makes a lot of sense.

I have code to search through the structure and return the path of the name (i.e. Item.subitem.subsubitem.subsubsubitem). Below is my code:

public class Item
{
                                                                //public Item[] subitem; <-- Array of Items
    public List<Item> subitem;                                  // <-- List of Items

    public Color itemColor = Color.FromArgb(50,50,200);
    public Rectangle itemSize = new Rectangle(0,0,64,64);
    public Bitmap itemBitmap = null;
    public string itemName;


    public string LocateItem(string searchName)
    {
        string tItemName = null;

        //if the item name matches the search parameter, send it up)
        if (itemName == searchName)
        {
            return itemName;
        }

        if (subitem != null)
        {

            //spiral down a level
            foreach (Item tSearchItem in subitem)
            {
                tItemName = tSearchItem.LocateItem(searchName);

                if (tItemName != null)
                    break;  //exit for if item was found
            }
        }


        //do name logic (use index numbers)
        //if LocateItem of the subitems returned nothing and the current item is not a match, return null (not found)
        if (tItemName == null && itemName != searchName)
        {
            return null;
        }

        //if it's not the item being searched for and the search item was found, change the string and return it up
        if (tItemName != null && itemName != searchName)
        {
            tItemName.Insert(0, itemName + ".");  //insert the parent name on the left -->  TopItem.SubItem.SubSubItem.SubSubSubItem
            return tItemName;
        }

        //default not found
        return null;
    }


}

My question is if there is an easier way to do this with lists? I've been going back and forth in my head as to whether I should use lists or just an array. The only reason I have a list is so that I don't have to make code to resize the array each time I add or remove an item.