2.2.7.4.1 buttonID Element
The buttonID XML element specifies the button element from an AsyncUIMessageBox string that was selected by the user.
If the selected button element has a buttonID attribute value of "IDOK", the buttonID element MUST contain the value 1. If the selected button element has a buttonID attribute value of "IDCANCEL", the buttonID element MUST contain the value 2. If the selected button element holds an integer value, the buttonID element MUST contain that value.
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<xs:element name="buttonID" type="xs:integer" />