WPF Dispatcher

Hi
I need som help with this code.

How do I write the Dispatcher for this listbox I have?

private void StatusUpdates(string message)
        {
            if (this.uxStatusUpdate.Dispatcher.Thread == Thread.CurrentThread)
            {
                this.uxStatusUpdate.Items.Add(message);
            }
            else
            {
                this.uxStatusUpdate.Dispatcher.BeginInvoke ????            
            }
        }

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