This event is fired after the row header column width has been adjusted by a user.
DayPilot.Scheduler.onRowHeaderColumnResized(args);
The column width specified using the rowHeaderColumns array is updated automatically.
DayPilotdp.onRowHeaderColumnResized = function(args) {
console.log("New column width: " + args.column.width);
console.log("All widths: " + dp.rowHeaderColumns.map(function(column) { return column.width; }).join("|"));
};