Hi I was reading code and I was wondering if we could have a simple NullPlugin to avoid bottom := self model plugins select: [:each | each position = #bottom ]. bottom ifEmpty: [ ^ nil ]. and bottomMorph := self buildBottomPlugins. bottomMorph ifNotNil: [ bottomHeight := bottomMorph height + 8 ]. aWindow addMorph: sourceCodeContainer fullFrame: ((0 @ self navigationAreaProportion corner: 1 @ 1) asLayoutFrame topOffset: middleHeight; bottomOffset: bottomHeight negated). bottomMorph ifNotNil: [ aWindow addMorph: bottomMorph fullFrame: ((0 @ 1 corner: 1 @ 1) asLayoutFrame topOffset: bottomHeight negated). bottomMorph color: Color transparent ] But I do not think that this is the solution. Just brainstorming.... I imagine that we should change the computation to go from bottomMorph := self buildBottomPlugins. bottomMorph ifNotNil: [ bottomHeight := bottomMorph height + 8 ]. aWindow addMorph: sourceCodeContainer fullFrame: ((0 @ self navigationAreaProportion corner: 1 @ 1) asLayoutFrame topOffset: middleHeight; bottomOffset: bottomHeight negated). bottomMorph ifNotNil: [ aWindow addMorph: bottomMorph fullFrame: ((0 @ 1 corner: 1 @ 1) asLayoutFrame topOffset: bottomHeight negated). bottomMorph color: Color transparent ] into bottomMorph := self buildBottomPlugins. bottomHeight := bottomMorph height + 8. aWindow addMorph: sourceCodeContainer fullFrame: ((0 @ self navigationAreaProportion corner: 1 @ 1) asLayoutFrame topOffset: middleHeight; bottomOffset: bottomHeight negated). bottomMorph addYourselfInto: aWindow. and for the Null version height returns 0 addYourselfInto: does nothing. What do you think? Stef