public class MyButton
	{
		public MyButton()
		{
		}		

		public string Text { get; set; }

		public event EventHandler Click;
	}
	
	var buttonDoIt = new MyButton()
			{				
				Text ="Test";
			};

			buttonDoIt.Click += buttonDoIt_Click;
			
		void buttonDoIt_Click(object sender, EventArgs e)
		{
			//do it
		}
		

		System.Reflection.BindingFlags bf = System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic;
				System.Reflection.FieldInfo field = buttonDoIt.GetType().GetField("Click", bf);
				MulticastDelegate dlg = (MulticastDelegate)field.GetValue(buttonDoIt);
		

ethodInfo clickMethodInfo = typeof(Button).GetMethod("OnClick", BindingFlags.NonPublic | BindingFlags.Instance);

clickMethodInfo.Invoke(buttonToInvoke, new object[] { EventArgs.Empty });

dlg.Method.Invoke(dlg.Target, new object[] { this, new EventArgs() });

public void raiseClick(){
        Click(this, new EventArgs());
   }