groupBy
groups grid content by values of the specified column
void groupBy(number ind,array mask);
|  ind | number | column index to group by | 
|  mask | array | optional, array, each value of which is mapped to the related column | 
Available only in PRO Edition
Example
//minimal parameters set. Group rows by the second column
myGrid.groupBy(1);
//maximal parameters set
myGrid.groupBy(2,["#stat_max","#title","","#stat_total","","#cspan","#cspan","#cspan"]);
Details
The values of the mask parameter are:
- title (string) - mandatory, will be used for group-key;
 
- cspan (string) - organize colspan with a sibling cell (the same as in cspan in header);
 
- stat_total (number) - calculates total of values for the group;
 
- stat_max (number) - calculates maximum value in the group;
 
- stat_min (number) - calculates minimum value in the group;
 
- stat_average (number) - calculates the average value in the group;
 
- stat_count (number) - calculates count of records in the group.
 
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