I have a method which returns Pane and On that pane are some button and ProgressBar everything work perfectly : But the problem is that when whenever I start a new Download It opens a new Pane on the same Position but I want to every new Download shoul be add in a new line.How can i achieve this?



  [Here is CODELink][1]


  [Here is the ImageLink][2]


  [1]: https://drive.google.com/open?id=1lgaSNnvyzXKjl-b86dTiEkjsqGF1oer_
  [2]: https://i.stack.imgur.com/cgitx.png