fires when the scale is re-rendered in order to display all tasks completely
gantt.attachEvent("onScaleAdjusted", function(){
var min = gantt.getState().min_date,
max = gantt.getState().max_date,
to_str = gantt.templates.task_date;
return gantt.message("Scale shows days from " + to_str(min)
+ " to " + to_str(max));
});
Note, the event will fire only if the fit_tasks property is set to true.