Oh Thank You Ben. It was indeed a very nice explanation. :) I was able to resolve my issue perfectly. But changing the code snippet to: *--------------------------------------------------------------------------- #initialize . . . boxWindow := box openInWindow. boxWindow setLabel: 'searchQuick - Browse Files'. box position: 150@0. boxWindow fullscreen. boxWindow color: Color black. ---------------------------------------------------------------------------* I can no longer position 'box' within 'boxWindow'. Any clue regarding this ? Regards Jigyasa -- View this message in context: http://forum.world.st/System-Windows-not-closing-on-using-close-tp4841568p48... Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.