<FirstButton> (First Radio Button)

This element specifies that the object is the first radio button in a set of radio buttons. If this element is specified without a value, it is assumed to be true. This element is used for radio buttons.

example:
<x:ClientData  ><x:FirstButton>True</x:FirstButton>
</x:ClientData>

The possible values for this element are defined by the ST_TrueFalseBlank simple type (§6.4.3.3).

Parent Elements

<ClientData>6.4.2.12)