Parent Updation depends on the child durations


I am new to dhtmlxTreeGrid and my requirement is like,
I have a parent task that contains columns named id,text,startdate,enddate and duration
And also i have set of childs to the parent. When i change the start date ,enddate and duration of childs , parent’s start date , end date and durations have to calculate accordingly like gantt chart.

Kindly help me…

Please, try to use the the math in the treegrid: … _math.html … intreegrid

Thanks. My grid contains startdate , enddate and duration.
My need is child’s minimum startdate and maximum finish date should be set to parent start date and finish date.