How to avoid buttons being disappeard after resizing and dragging jQuery dialog

How to avoid buttons being disappeard after resizing and dragging jQuery dialog

I have a jQuery UI dialog here in  Jsfiddle  with the below properties set to true. 

 draggable: true, resizable: true

The issue is that the button is getting disappeared when i resize/drag the dialog, It looks like its jQuery UI's default behaviour.

I would like to see the button still show even after resizing and dragging