Class new title: StackPaneNT subclassof: StackPane fields: ' ' declare: '' close [super close] context: t1 instance: t2 code: t3 [contextVarPane _ t1. instanceVarPane _ t2. codePane _ t3. variables _ Stream new of: (Vector new: 16). proceed  nil  [proceed _ false , nil , 1]] processFrame: t1 [self context: false instance: false code: false. self interrupt: false. self of: t1 inVector]