Workaround for NSButton event handler in XamMac/MonoMac

MainWindowController.AwakeFromNib method

 public override void AwakeFromNib()
{
	NSButton targetButton = new NSButton(new RectangleF(removeButton.Frame.Left + 100, removeButton.Frame.Top, removeButton.Frame.Width, removeButton.Frame.Height));
	this.view.AddSubview(targetButton);
	addButton.Activated += (object sender, EventArgs e) =>
	{
		Console.WriteLine("Added");
		targetButton.RemoveFromSuperview();
		targetButton = new NSButton(new RectangleF(removeButton.Frame.Left + 100, removeButton.Frame.Top, removeButton.Frame.Width, removeButton.Frame.Height));
		this.view.AddSubview(targetButton);
		targetButton.Activated += HandleActivated
	};
	removeButton.Activated += (object sender, EventArgs e) =>
	{
		Console.WriteLine("Removed");
		targetButton.Activated -= HandleActivated;
	};
}

public void HandleActivated (object sender, EventArgs e)
{
	Console.WriteLine("Event Handled -------->>" + DateTime.Now.ToString());
}