title: QT QStackedLayout problem
body: <p>I would like to ask about QStackedLayout.
  Now, I have a several widgets added to the QStackedLayout
  And I want to do sth like that:
  When user switch to Page X, refresh Page X.</p>
  
  <p>How can I do that?
  I have a custom code that I want to run when it refreshes
  Thank You very much</p>