+ wxWindow* btn1 = new TestButton(parent, "1", wxPoint(10, 10));
+ wxWindow* btn2 = new TestButton(parent, "2", wxPoint(10, 90));
+ wxWindow* btn3 = new TestButton(btn2, "3", wxPoint(20, 20));
+
+ // We need this to realize the windows created above under wxGTK.
+ wxYield();
+