Brand wise searching in product orderer report

1. I am trying to extend product order report and add one Attribute of product brand and put into grid.phtml.

2. when i select brand and click on refresh button.

3. report will not display brand wise searching what can i do?

product order report image link Visit http://imageshack.us/photo/my-images/405/productorder.jpg/

grid.phtm Code

<?php 
$attributeInfo = Mage::getResourceModel('eav/entity_attribute_collection')
->setCodeFilter('brand')
->getFirstItem();
$attributeOptions = $attributeInfo->getSource()->getAllOptions(false);
                            ?>
                    </div>

                    --><div class="f-left">
                    <?php echo $this->__('Brand') ?>:
                    <select name="brand" id="brand" style="width:6em;">
                    <?php foreach ($attributeOptions as $_value=>$_label): ?>
                        <option value="<?php echo $_value ?>" <?php if($this->getFilter('brand')==$_value): ?> selected<?php endif; ?&g开发者_StackOverflowt;><?php echo $_label['label'] ?></option>
                       <?php //error_log("Lable".print_r($_label,TRUE));?>
                    <?php endforeach;  ?>
                    </select>

                </div>