ReadState is part of a sequence of calls used by the streaming system that loads and saves VCL components. It reads the values of all the radio group's published properties, stored data, and owned components from the reader object passed in Reader. Do not call ReadState directly. ReadState calls the inherited ReadState method to read the radio group’s published properties and other stored data to a reader object. It then initializes and redraws the buttons in the group. 

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