This method must be called from a Windows Form thread (in my experience). If you want to call it in an automation, make sure it is being called off of the click event from a control on a Windows Form. If you want to call it elsewhere (like off of an activity or an event within an adapter), create a Windows Form with a button on it, show the form (the button and form must both be visible for the click event to fire, although the button can be behind something else to hide it from a user), call PerformClick on the button, and then use the Click event of that button to trigger the method call.