Made the "Title and Text" message box parented like it should have been. This will also allow me to evaluate what happens if message boxes that are parented are closed in non-reverse order.

test/main.go

@@ -538,7 +538,7 @@ func (handler *testwinhandler) Event(e Event, d interface{}) {
 			invalidTest(handler.cb1, handler.lb1, nil, nil)
 		case handler.bmsg:
 			MsgBox("Title Only, no parent", "")
-			MsgBox("Title and Text", "parent")
+			handler.w.MsgBox("Title and Text", "parent")
 		}
 // == TODO ==
 //	case CusotmEvent: