A check box: one or more widgets that toggle together between an on and an off state.
public sealed class PdfCheckBoxField : PdfToggleButtonField
ISO 32000-2 §12.7.5.2.3; Pushbutton and Radio flags clear.
kind:method, kind:property, kind:ctor. Press Esc to clear.IsCheckedGets a value indicating whether the box is checked: its value is a state other than Off.SetChecked(Boolean)Checks the box (in its current on state, else the first widget's) or clears it.