C# Add Controls To Panel In a Loop

I wish to add a button for every line in a file to a panel. My code so far is:

StreamReader menu = new StreamReader("menu.prefs");
int repetition = 0;

while(!menu.EndOfStream)
{
    Button dynamicbutton = new Button();
    dynamicbutton.Click += new System.EventHandler(menuItem_Click);
    dynamicbutton.Text = menu.ReadLine();
    dynamicbutton.Visible = true;
    dynamicbutton.Location = new Point(4+repetition*307, 4);
    dynamicbutton.Height = 44;
    dynamicbutton.Width = 203;
    dynamicbutton.BackColor = Color.FromArgb(40,40,40);
    dynamicbutton.ForeColor = Color.White;
    dynamicbutton.Font = new Font("Lucida Console", 16);
    dynamicbutton.Show();
    menuPanel.Controls.Add(dynamicbutton);
    repetition++;
    MessageBox.Show(dynamicbutton.Location.ToString());
}
menu.Close();

The problem is that only the first control gets created.