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How to I get the dhtmlxCalendar field values in my dhtmlxGrid

I use dhtmlxCalendar in a dhtmlxGrid cell, I got all cell value from the method of getValue(), but can not get the dhtmlxCalendar field value................

init grid code :
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cGrid = new dhtmlXGridObject('clientGrid');
cGrid.setImagePath("../../../inc/js/editgrid/imgs/");
cGrid.setColumnIds"Column1,Column3,Column3");
cGrid.setHeader("Column1,Column3,date");
cGrid.setInitWidths("30,150,*");
cGrid.setColTypes("ro,ed,dhxCalendar");
cGrid.setColAlign("right,left,left");
cGrid.setColSorting("int,str,date");
cGrid.init();
cGrid.setSkin("dhx_skyblue");
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get value code :
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getGridData: function(){
    var allItemID = new Array(0);
    var modiItemID = new Array(0);// copy of allitemid
    var a = 0; // modiItemID array index
    var iflag = 0;

    var saveFlag = false;
    var blankFlag = false;
    var gridColumns = this.getColumnCount();
    var dataXML = null;

    allItemID = this.getAllItemIds().split(",");

    // rows
    for (var i = 0; i < allItemID.length; i++) {
        var modiFlag = false;
        // columns
        for(var j = 0; j < gridColumns; j++){
            if(this.cells(allItemID[i],j) != null) {
                if(this.cells(allItemID[i],j).wasChanged()){
                    modiFlag = true;
                }

                var cellValue = this.cells(allItemID[i],j).getValue(); //==============this is the method getvalue
                
                if (cellValue != "" && cellValue.length != 0 && cellValue != null) {
                    iflag++;
                }
            }        
        }

        if (iflag > 1) {
            modiItemID[a++] = allItemID[i];
        }
    }

    if(modiItemID.length > 0){
        dataXML = "<?xml version='1.0' encoding='UTF-8'?><data>";
        for(var i = 0; i < modiItemID.length; i++){
            if(modiItemID[i].length > 0){
                dataXML += "<row id='" + modiItemID[i] + "'>";
                for(var j = 0; j < gridColumns; j++){
                    dataXML += "<cell>";
                    var cellValue = this.cells(modiItemID[i],j).getValue();
                    if(cellValue.indexOf("<") != -1){
                        dataXML += cellValue.substring(cellValue.indexOf(">")+1, cellValue.indexOf("</"));
                    } else {
                        dataXML += cellValue;
                    }
                    dataXML += "</cell>";
                }
                dataXML += "</row>";
            }
        }
        dataXML += "</data>";
    }
    return dataXML;
},

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pls help me, How to I get the dhtmlxCalendar field values in my dhtmlxGrid.....

thanks verry, verry much

I can get the vaule by "grid.cells(..).cell.innerHTMl".

The date is insert calender cells when output the div html code , but I can't get the value by getValue()