Close a group started with BeginHorizontal.

	// Create a Horizontal Compound Button
	
	class BeginEndHorizontalExample extends EditorWindow {
	
		@MenuItem("Examples/Begin-End Horizontal usage")
		static function Init() {
			var window = GetWindow(BeginEndHorizontalExample);
			window.Show();
		}
		
		function OnGUI() {
			var r : Rect = EditorGUILayout.BeginHorizontal("Button");
				if (GUI.Button(r, GUIContent.none))
					Debug.Log("I Got Pressed!");
				GUILayout.Label("I'm inside the button");
				GUILayout.Label("So am I");	
			EditorGUILayout.EndHorizontal();
		}
	}