how to get value when grid finished load from xml?

how to get value when grid finished load from xml?
example here.
mygrid = new dhtmlXGridObject(‘gridbox’);
mygrid.setImagePath("…/…/codebase/imgs/");
mygrid.setHeader(“Name,Date of Birth, First Book Published”);
mygrid.setInitWidths("*,100,100");
mygrid.setColAlign(“left,center,center”);
mygrid.setColTypes(“ed,dhxCalendar,dhxCalendarA”);
mygrid.setColSorting(“str,date,date”);
mygrid.setSkin(“dhx_skyblue”);
mygrid.init();
mygrid.loadXML("…/common/grid_dates.xml");

var d = mygrid.cellById(“row_id”, col_index).getValue();

Please, try to use callback function of load method or onXLE event:
1.

var d mygrid.loadXML("../common/grid_dates.xml",function(){ d = mygrid.cellById("row_id", col_index).getValue(); });

var d mygrid.attachEvent("onXLE", function(){ d = mygrid.cellById("row_id", col_index).getValue(); });