Problem with two grids, one of them using connector

Hello, I have a problem on a page in which I use two grids, one is connected using dhtmlxConnector and the other is not.
The problem is that the first one (w/dhtmlxConnector) works ok but it seems that it forces the other one to work as if it were connected using dhtmlConnector too (the filters try to make ajax calls when they shouldn’t).
Is there any problem when using two grids with different configurations? All examples that I’ve seen in the site just use a single grid.

Here is a bit of my code:
This is the first grid:

      mygrid = new dhtmlXGridObject('myGrid');
      mygrid.setHeader("Ejercicio,Nro Cotización,Llamado,Fecha Pedido,
              Fecha y Hora Cierre,Tiempo Restante (días),Estado,Acciones,
              #cspan,#cspan,#cspan,#cspan",null,null);
      mygrid.setColumnIds("EJERCICIO,NRO_COTI,NRO_LLAMADO,FECH_PED,FECH_APERT,
              DIAS_RESTANTES,ESTADO,visualizar,imprimir,publicar,cancelar,cotizar");
      mygrid.attachHeader("#connector_text_filter,#connector_text_filter,#connector_text_filter,            
              #connector_text_filter,#connector_text_filter,#connector_text_filter,
              #connector_select_filter,,,,,");
      mygrid.setColTypes("ro,ro,ro,ro,ro,ro,ro,ro,ro,ro,ro,ro");  
      mygrid.setColSorting("connector,connector,connector,connector,connector,connector,
              connector,na,na,na,na,na");
      mygrid.init();
      mygrid.enableSmartRendering(true);
      mygrid.loadXML("servlet/pedidoscotizacion?MODE=getxmlgrid&date="+new Date());

This is the second grid:

      mygridPrices = new dhtmlXGridObject('pricesGrid');
      mygridPrices.setImagePath("web/lib/dhtmlx/dhtmlxGrid/codebase/imgs/");
      mygridPrices.setHeader(",Item,Cantidad,Unidad,Descripción");
      mygridPrices.attachHeader(",#text_filter,#text_filter,#text_filter,#text_filter");
      mygridPrices.setColAlign("center,center,center,center,left");
      mygridPrices.setColTypes("ch,ro,ro,ro,ro");
      mygridPrices.setColSorting("str,str,str,str,str");
      mygridPrices.init();
      mygridPrices.enableSmartRendering(true);
      mygridPrices.loadXML("servlet/pedidoscotizacion?
              MODE=getXMLItems&ejercicio="+ejercicio+"&nroCotiz="+nroCotiz+
              "&nroLlamado="+nroLlamado+"&date="+new Date());

If I left the code as posted here, the first grid works ok and the second grid’s filters don’t work because they behave as if they were connecting using dhtmlxConnector.

If in the first grid, I comment the line starting with “mygrid.attachHeader…”, the second starts working ok (filters work like a traditional grid).

Any advice or help will be more than appreciated.
Thanks.
Daniel.