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Suppose that, with a view toward illustrating the role of value holders, you use the VisualWorks GUI builder to construct a user interface with two sliders and one input field.
Your intent is that the sliders and the input field all show the same value. If you move a slider, the other slider and the input field are to follow the change:
The button-clicking ritual that you use to construct the interface using the GUI builder is described in Appendix••missing reference••. In the rest of this chapter, you learn how the interface functions, once it has been constructed.