[Pharo-users] adding messages dinamically to a single instance object

Hi all. I need to know how can i do if i want add new behaviour ( a new method ) to a single instance object of a class. It means not to add new selector to the class but i want a single instance responds that mesage. Where can i read about it? Tia Ing. Pablo Digonzelli Software Solutions IP-Solutiones SRL Dividato SA 25 de Mayo 521 San Miguel de Tucumán Email: pdigonzelli@softsargentina.com pdigonzelli@gmail.com Cel: 5493815982714