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This paper focuses on the techniques involved in building an interactive application using a plastic user interface. These techniques take advantage of the QTk toolkit, a toolkit that features unusual but interesting concepts with respect to more classical object-oriented toolkits. These features are possible thanks to the underlying programming language used, Oz. In particular, it can support all facilities provided by symbolic records like XML structures and more than that. It also exhibits the capacity to wrap any languages entities into higher order data structures. This paper shows by a case study how the combination of QTk and Oz helps developers write plastic user interface very easily.