Hi I am using *SystemWindow* to open a Morph in my application *searchQuick*. ( https://github.com/jig08/sQuick_new ) On clicking a button, a new screen opens up but the prev window fails to close, though I have tried using #close methods. The code snippets are as: *------------------------------------------------------------------------------------------------------------------* *IndexInterface>>**#initialize* *. . . . . .* * boxWindow := SystemWindow new.* * box position: 150@0.* * boxWindow addMorph: box.* * boxWindow extent: World extent.* * boxWindow openInWindowLabeled: 'searchQuick'.* * boxWindow fullscreen.* * boxWindow color: Color black.* *. . . . . . .* browseBtn on: #click send: #value to: [self boxWindow window close. IndexInterface delete. BrowseFiles open]. *-------------------------------------------------------------------------------------------------------------------* *IndexInterface>>#delete* * box isNil ifFalse: [ self boxWindow window close. * * self boxWindow window delete . * * self boxWindow close. * * box window close .* * self boxWindow delete. * * box delete.].* * box := nil.* * self boxWindow window close. * * self boxWindow window delete .* * self boxWindow close. * * self boxWindow delete.* * boxWindow := nil.* *-------------------------------------------------------------------------------------------------------------------* Help appreciated. Regards Jigyasa