Add item throught another class

public partial class frmHoofd : Form
 {
     private ContrlVoorgerechten u1;

     public frmHoofd()
     {
         InitializeComponent();
     }      

     public void UpdatingListView()
     {
       //  MessageBox.Show("need to update");
     }

     private void btVoorgerechten_Click(object sender, EventArgs e)
     {
           //calling the Usercontrole
           u1 = new ContrlVoorgerechten() ;
           //u1.Dock = DockStyle.Fill;
           u1.Width = 750;
           u1.Height = 477;
           u1.Location = new Point(430, 165);

           this.Controls.Add(u1);
     }

 }

public partial class ContrlVoorgerechten : UserControl
{

    public ContrlVoorgerechten()
 {
     InitializeComponent();
     AddButton addButton = new AddButton();
     int twintig = 17;//eerste rij
     int honderdvijf = 135;//tweede rij
     int tweehonderdvijf = 250; // derde rij
     addButton.New( this, "1.Tom-Yam", 2, twintig, "Images.jpg", "8");
     addButton.New(this, "2.Tom-Kha", 165, twintig, "Images.jpg","8");
     addButton.New(this, "3.Wantan", 325, twintig, "Images.jpg", "8");
}

internal class AddButton
 {
     //public delegate void MyDelegate(Bestelling _bestelling);
     public EventHandler<Bestelling> ClickEvent;

     public void New(UserControl user, String text, int Location_X, int Location_Y, String stringPath, string prijs)
     {
         System.Windows.Forms.Button button = new System.Windows.Forms.Button
         {
             Text = text,

             Location = new Point(Location_X, Location_Y),
             Name = prijs,

             TextAlign = ContentAlignment.BottomCenter,
             Font = new Font("Microsoft Sans Serif", 11),
             BackColor = Color.White,
             Width = 150,
             Height = 100,
             FlatStyle = FlatStyle.Flat,
             Image = System.Drawing.Image.FromFile(stringPath)
         };
         button.Click += BTNclick;
         user.Controls.Add(button);
         user.CreateControl();

         // button.Click += new System.EventHandler(OnClick);
     }

     public void BTNclick(object sender, EventArgs e)
     {

     System.Windows.Forms.Button clickedbtn = sender as System.Windows.Forms.Button;

         Bestelling orders = new Bestelling();

          orders.setDiscription(clickedbtn.Text); //6.Tod Monpla
          orders.setPrice(Convert.ToInt32(clickedbtn.Name));
          orders.setAantal(1);

         //FrmHoofd frm = new frmHoofd();
         //ClickEvent.Invoke(this, bestelling);

        /* clDelegates _delegate = new clDelegates(this);
         _delegate.UpdateGrid(bestelling);*/

     }