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HTML select filters on grid

Hi,

Using the HTML select filters, currently the blank entry means "no filtering". Is it possible to change this so we have a dummy "All" value instead, and have the blank entry really mean "those rows where the value of the cell is actually blank"?

Thanks,

>> Is it possible to change this so we have a dummy "All" value instead

Can be done only by code modification
dhtmlxgrid_filter.js 
dhtmlXGridObject.prototype._loadSelectOptins=function(t,c){ 
        var l=this.collectValues(c);
        t.innerHTML="";
        t.options[0]=new Option("","");

can be replaced with 

        t.options[0]=new Option("All","");

>>and have the blank entry really mean "those rows where the value of the cell is actually blank
mygrid.attachEvent("onFilterStart",function(a,b){
    if (a[INDEX]=="") a[INDEX]=function(val){ return val==""; }
    return true;
});
where INDEX - index of column in which select filter used