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To use the new bidirectional properties in custom widgets, there are two API that now accept special arguments:
- pui.widgets.add - the "constr", "render", and "getValue" options are added for pui.BasicWidget. The "render" and "getValue" options for pui.widgets.add may be sufficient for most needs. For more advanced use, the constructor of a subclass of pui.BasicWidget can be specified for "constr".
- pui.addCustomProperty - the "bidirectional" and "showDesignValue" options are added for pui.BasicWidget
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