Laurent, coincidere change this method (o part of): TilingWM>>newTopWindowBoundsInArea: aBlock SystemWindow topWindow bounds: (aBlock value: world clearArea). to this one: TilingWM>>newTopWindowBoundsInArea: aBlock | topWindow | (topWindow := SystemWindow topWindow) isMaximized ifTrue: [ topWindow expandBoxHit. topWindow bounds: (aBlock value: world clearArea) ] ifFalse: [ topWindow bounds: (aBlock value: topWindow bounds) ] For one hand this solve the problem of maximized state on moved window, and for other hand apply recursive "moving" of window based in their current bounds (but not usable display area) if that is not in state maximize (I choose this rule for my convenience). --- When I load new version of this package, I use the Settings to see new version de la barra, but the old version keep visible too, and I use SHIFT-ALT-Click to see the halos and remove this. Is possible clean up of older versions of bar automatically? ---- And I see that you comming work in TWMWindowSnapshot :) I like it, I hate wasting time accommodating the size and position of the windows manually because I want to have another hearing, again and again!