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void setXMLData( XMLHttpRequest request )
This method allows passing of an already retrieved XMLHttpRequest object to an AjaxDataHandler descendant. When used in conjunction with the onNeedsData event, this method allows interaction with pre-existing 3rd party Ajax libraries instead of the request pool built into the chart library.
If the data handler is not currently in the loading state (i.e. onNeedsData was triggered), calling this method will have no effect.