@# Checkbox
A checkbox is a form control that is either in a checked, unchecked or indeterminate state.
@example CheckboxExample

@## Controlled checkbox
A "controlled" checkbox can only be toggled through external state.
@example CheckboxControlledExample

@## Indeterminate state
A checkbox can be in a "partially checked" or indeterminate state.
@example CheckboxIndeterminateExample

@## Checkbox Attrs
@interface ICheckboxAttrs