select field issue with String ID about jsgrid HOT 1 CLOSED

{ name: "source", title:"Source", type: "select", 
  items: db.sources, valueField: "Id", textField: "Name"
  editValue : function() { return this.editControl.val(); }, // for editing
  filterValue : function() { return this.filterControl.val(); }, // for filter
  insertValue : function() { return this.insertControl.val(); } // for insert
} 

function TextSelectField(config) {
    jsGrid.SelectField.call(this, config);
}

TextSelectField.prototype = new jsGrid.SelectField({

    sorter: "string",

    filterValue: function() {
        return this.filterControl.val();
    },

    insertValue: function() {
        return this.insertControl.val();
    },

    editValue: function() {
        return this.editControl.val();
    }
});

jsGrid.fields.textSelect = TextSelectField;