update asserts

examples/widgets/msgbox/lv_example_msgbox_1.py

@@ -0,0 +1,12 @@
+def event_handler(obj, event):
+    if event == lv.EVENT.VALUE_CHANGED:
+        print("Button: %s" % lv.mbox.get_active_btn_text(obj))
+
+btns = ["Apply", "Close", ""]
+
+mbox1 = lv.mbox(lv.scr_act())
+mbox1.set_text("A message box with two buttons.");
+mbox1.add_btns(btns)
+mbox1.set_width(200)
+mbox1.set_event_cb(event_handler)
+mbox1.align(None, lv.ALIGN.CENTER, 0, 0)  # Align to the corner