This one shows a label, until you resize the window. Then the label disappears. If you shrink the window back to its original size, the label reappears. /usr/local/cpython-3.7/bin/python3 ./just-a-label.py This one shows an invisible button. But click the button, and its action is executed. But you still cannot see the button. /usr/local/cpython-3.7/bin/python3 ./just-a-button.py