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DataProcessor Issue

Hi guys,
I`ve a datagrid that can be change manually cell by cell and can be changed by group of cels, in the second case for some reason the dataprocessor don't call the update process.

here is my code, can you help me?

//cria o menu de contexto dos itens ja selecionados
menuAlt = new dhtmlXMenuObject(null, "standard");
menuAlt.setImagePath("TreeGrid/codebase/imgs/");
menuAlt.setIconsPath("TreeGrid/codebase/imgs/");
menuAlt.renderAsContextMenu();
menuAlt.setOpenMode("web");
menuAlt.attachEvent("onClick", onButtonClick);
menuAlt.loadXML("TreeGrid/xml/menuAlterar.xml");

mygrid = new dhtmlXGridObject('gridbox');
     mygrid.setImagePath("TreeGrid/codebase/imgs/");
var flds = "Código,Brand ME,Brand MR, Atualizado";
mygrid.setImagePath("TreeGrid/codebase/imgs/");
mygrid.setHeader(flds);
mygrid.setColumnIds("id,brand_me,brand_mr,last_update");
mygrid.setInitWidths("60,255,255,0");
mygrid.setColAlign("center,left,left,left");
mygrid.setColTypes("ro,ro,ed,ro");
mygrid.setColSorting("str,str,str,str");
mygrid.setSkin("light");
//mygrid.setColumnColor("white,,,");
mygrid.enableTooltips("false,false,false,false");
mygrid.setColumnHidden(3,true);
mygrid.init();
//mygrid.loadXML("anun.xml");
mygrid.loadXML("PopulaGrid.aspx?op=2&c="+idcliente);

mygrid.enableContextMenu(menuAlt);

myDataProcessor = new dataProcessor("update.aspx?op=3&c="+idcliente);
myDataProcessor.setUpdateMode("cell");
myDataProcessor.enableDataNames(true);
myDataProcessor.setTransactionMode("POST",true);
myDataProcessor.init(mygrid);
}

function onButtonClick(menuitemId) {
if (menuitemId == "Ren") {
var items = mygrid.getSelectedId().split(",");

novovalor = prompt("new value for the cells: ", "")

myDataProcessor.setUpdateMode("off");
for (var i = 0; i < items.length; i++) {
mygrid.cells(items[i], 2).setValue(novovalor)
myDataProcessor.sendData();
}
myDataProcessor.setUpdateMode("cell");

}

}