var errorMask = new Ext.LoadMask(Ext.getCmp('Panel1'), {msg:"Not Available"});
    var $records =store.getRange();


    var count = 0;
    for (var $i= 0; $i<$records.length;$i++){
        if($records[$i].data.Price>0){
            count++
        }
    };
    if(count<1){
        errorMask.show();
    }