jQuery Grid Plugin - jqGrid

Hello, i have a grid with subgrid. I would like to expand all the rows at the load of the page ( or pressing a button later, or anyway :P), but it only expands the first row that i call. This is the code i'm using

function cargaSublistados(){
    var ids = jQuery("#list1").getDataIDs();
    jQuery.each(ids, function (){
        jQuery("#list1").expandSubGridRow(this);

    });
}

It opens all the rows, but the content of them is not loaded, just the first one. I've tried to do it manually, and i only get the first call to the function to work correctly, the rest just open the row but don't load the content. I'm using jqgrid version 3.5.1 and jquery version 1.3

Thank you.