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\param[in] item The item whose label text is returned.
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\returns The item's text label. (Can be NULL if blank)
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This optional method should be provided by the subclass
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to efficiently swap browser items \p a and \p b, such as for sorting.
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\param[in] a,b The two items to be swapped.
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This method must be provided by the subclass
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to return the item for the specified \p index.
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\param[in] index The \p index of the item to be returned
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\returns The item at the specified \p index.
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// you don't have to provide these but it may help speed it up:
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virtual int full_width() const ; // current width of all items
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virtual int full_height() const ; // current height of all items