void setMultiFormat(int filterId, const char *formatString, int labelSpan = 1, bool promoteFirst = true);

Adds one filter and format string to the multi-format lists.

Please refer to Axis.setMultiFormat on how to use this method.

Argument	Default	Description
filterId	(Mandatory)	The filter that defines a subset of labels.
formatString	(Mandatory)	The format string for formatting the subset defined by the above filter.
labelSpan	1	The number of label positions that are claimed by one label. If a label occupies more than 1 position, ChartDirector will not put labels on nearby positions, even if they meet the filter criteria.
promoteFirst	true	If set to true, the first label will be promoted to a higher filter category in the multi-format list.

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