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int selectedIndex(void);
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*return the index of the first checked item. return -1 if none of them checked.
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bool editable()const;
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*always return true.
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void set(const void *flags);
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*set the status (checked or unchecked)for each item.
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bool& operator[](unsigned int index);
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*return the checked status for the item indexed by parameter index.
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int length(void);
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*return the number of items
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