private void add_button(string text, EventHandler evt, int index)
{
// code for vertical buttons on the right, they are custom controls
// without support for form designer, so we initiate them in code
var btn = new VButton();
btn.Text = text;
btn.Anchor = AnchorStyles.Right;
btn.Width = 20;
btn.Height = 75;
btn.Top = index * 80;
//btn.Left = this.Width - 35;
//btn.Left = btn_help.Right - btn.Width;
btn.Left = 5;
Controls.Add(btn);
btn.Click += evt;
vbtn.Add(btn);
}