title: pharo smalltalk, blocking dialog and parents windows
body: <p>I'm doing an application in Pharo. And I am designing some GUI with UIBuilder.  </p>
  
  <p>I am manipulating windows, and these windows creates others windows (or dialogs).  </p>
  
  <p>My question is how to do for when I close the Main window, all the other secondaries close too.<br>
  And how to do when a dialog pops up, to block the program until the dialog is closed.  </p>
  
  <p>thank you very much!</p>