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protected void AddSymbolLeistenButton(ButtonItem btnItem)
{
    Button newBtn;
    const int heightWidth = 25;

    if (btnItem != null)
    {
        newBtn = new Button();
        newBtn.Name = btnItem.Name;
        newBtn.Tooltip = btnItem.Tooltip;
        newBtn.Size = new Size(heightWidth, heightWidth);
        newBtn.Image = btnItem.Image;
        // TODO: Click-Event kopieren
        //var handler = btnItem.GetType().GetEvent("Click");
        //newBtn.Click += new EventHandler(handler);
        this.SymbolLeiste.Add(newBtn);
    }
}					

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protected void AddSymbolLeistenButton(ButtonItem btnItem, EventHandler onClick)
{
  // ...
  newBtn.Click += onClick;
}					

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FieldInfo fiEvents = typeof(Component).GetField("events", BindingFlags.NonPublic | BindingFlags.Instance);
FieldInfo fiEventClickKey = typeof(Control).GetField("EventClick", BindingFlags.NonPublic | BindingFlags.Static);

EventHandlerList list = (EventHandlerList)fiEvents.GetValue(meinButton);
object listEntry = typeof(EventHandlerList).InvokeMember("Find", BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.InvokeMethod, null, list, new object[] { fiEventClickKey.GetValue(button1) });
FieldInfo fiClickDelegate = listEntry.GetType().GetField("handler", BindingFlags.NonPublic | BindingFlags.Instance);

EventHandler click = (EventHandler)fiClickDelegate.GetValue(listEntry);

andererButton.Click += click;