Gui button up?

Code (CSharp):

1. public void OnGUI(){
2.         if (GUI.Button (new Rect (Screen.width * 0.85f, Screen.height * 0.05f, Screen.width * 0.10f, Screen.width * 0.05f), "Go")) {
3.             print ("button down");
4.         } else {
5.             print ("button up");
6.         }

I am trying to detect when a GUI button is held down, and when it is not currently being held down.. Anyone know how this works in C#?

Thanks

 

Code (CSharp):

1. if(Event.current.type == EventType.MouseDown && rect.Contains(Event.current.MousePosition))

 

Gui. RepeatButton