title: JavaFX new custom pop out window
body: <p>I am searching for the example of pop out windows in JavaFX.
  I have JavaFX application and at one point I need a pop out window to appear. this popout windows needs some complicated inputs which I need to process and check and come back to main appliation/window. </p>
  
  <p>Now the problem is I can not find anywhere an example how in one JavaFX controller class call now JavaFX pop out window? I only find examle how to make Dialog pop out windows but I can not find example of a new pop out window based on JavaFX (I saw one solution where there is two windows in paralel but I would need one to be created only when needed).</p>
  
  <p>Do you know of such example of JavaFx custom popout window?</p>