Creates a radio button. This element must be used within CKForm or HTML form.
Bindings
Required attributes: selection and value, or checked
checked: | If neither "value" nor "selection" attribute is nil and
the value of "selection" is equal to that of "value",
the check box is checked.
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value: | When the check box is checked, the value of "value" attribute is
set to the component by the method specified by "selection"
attribute.
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selection: | Object that the user chose from the check box.
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disabled: | If the value is true, the element appears but is not active.
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