Turns widget on: the field's value becomes its on state, as when the user clicks it.
public void Select(PdfWidgetAnnotation widget)
One of the field's widgets (Widgets) that has an on state.
ISO 32000-2 §12.7.5.2.3, §12.7.5.2.4 and Table 229, as SetValue(CosName) describes, except that of radio buttons without RadiosInUnison exactly this widget turns on, even when another has the same on state.