Please try the below changes that I have made:
1.) Put below edit function in your store controller
public function editAction()
{
$id = $this->getRequest()->getParam("store_id");
$model = Mage::getModel("store/block")->load($id);
if ($model->getStoreId()) {
Mage::register("store_block", $model);
$this->loadLayout();
$this->_addContent($this->getLayout()->createBlock("store/adminhtml_store_edit"));
$this->_addLeft($this->getLayout()->createBlock("store/adminhtml_store_edit_tabs"));
$this->renderLayout();
} else {
Mage::getSingleton("adminhtml/session")->addError(Mage::helper("store")->__("Item does not exist."));
$this->_redirect("*/*/");
}
}
2.) add below code in Tabs.php within Offline/Store/Block/Adminhtml/Store/Edit/
<?php
class Offline_Store_Block_Adminhtml_Store_Edit_Tabs extends Mage_Adminhtml_Block_Widget_Tabs
{
public function __construct()
{
parent::__construct();
$this->setId("store_tabs");
$this->setDestElementId("edit_form");
$this->setTitle(Mage::helper("store")->__("Item Information"));
}
protected function _beforeToHtml()
{
$this->addTab("form_section", array(
"label" => Mage::helper("store")->__("Item Information"),
"title" => Mage::helper("store")->__("Item Information"),
"content" => $this->getLayout()->createBlock("store/adminhtml_store_edit_tab_form")->toHtml(),
));
return parent::_beforeToHtml();
}
}
3.) add below code in Form.php within Offline/Store/Block/Adminhtml/Store/Edit/
<?php
class Offline_Store_Block_Adminhtml_Store_Edit_Form extends Mage_Adminhtml_Block_Widget_Form
{
protected function _prepareForm()
{
$form = new Varien_Data_Form(array(
"id" => "edit_form",
"action" => $this->getUrl("*/*/save", array("id" => $this->getRequest()->getParam("store_id"))),
"method" => "post",
"enctype" =>"multipart/form-data",
));
$form->setUseContainer(true);
$this->setForm($form);
return parent::_prepareForm();
}
}
4.) add below code in Form.php within Offline/Store/Block/Adminhtml/Store/Edit/tab/
<?php
class Offline_Store_Block_Adminhtml_Store_Edit_Tab_Form extends Mage_Adminhtml_Block_Widget_Form
{
protected function _prepareForm()
{
$form = new Varien_Data_Form();
$this->setForm($form);
$fieldset = $form->addFieldset("store_form", array("legend"=>Mage::helper("store")->__("Item information")));
$fieldset->addField('store_id', 'hidden', array(
'name' => 'store_id',
));
$fieldset->addField('name', 'text', array(
'name' => 'name',
'label' => Mage::helper('store')->__('Name'),
'title' => Mage::helper('store')->__('Name'),
'required' => true,
));
$fieldset->addField('short_description', 'textarea', array(
'name' => 'short_description',
'label' => Mage::helper('store')->__('Short description'),
'title' => Mage::helper('store')->__('Short description'),
'style' => 'height:16em',
'required' => true,
));
$fieldset->addField('description', 'textarea', array(
'name' => 'description',
'label' => Mage::helper('store')->__('Description'),
'title' => Mage::helper('store')->__('Description'),
'style' => 'height:16em',
'required' => true,
));
$fieldset->addField('position', 'text', array(
'name' => 'position',
'label' => Mage::helper('store')->__('Position'),
'title' => Mage::helper('store')->__('Position'),
'required' => true,
));
$fieldset->addField('status', 'select', array(
'label' => Mage::helper('store')->__('Status'),
'title' => Mage::helper('store')->__('Status'),
'name' => 'status',
'required' => true,
'options' => Mage::getModel('store/source_status')->toArray(),
));
$fieldset->addField('country', 'text', array(
'name' => 'country',
'label' => Mage::helper('store')->__('Country'),
'title' => Mage::helper('store')->__('Country'),
'required' => true,
));
$fieldset->addField('state_province', 'text', array(
'name' => 'state_province',
'label' => Mage::helper('store')->__('State/Province'),
'title' => Mage::helper('store')->__('State/Province'),
'required' => false,
));
$fieldset->addField('city', 'text', array(
'name' => 'city',
'label' => Mage::helper('store')->__('City'),
'title' => Mage::helper('store')->__('City'),
'required' => false,
));
$fieldset->addField('street', 'text', array(
'name' => 'street',
'label' => Mage::helper('store')->__('Street'),
'title' => Mage::helper('store')->__('Street'),
'required' => false,
));
$fieldset->addField('zip_code', 'text', array(
'name' => 'zip_code',
'label' => Mage::helper('store')->__('Zip Code'),
'title' => Mage::helper('store')->__('Zip Code'),
'required' => false,
));
$fieldset->addField('telephone', 'text', array(
'name' => 'telephone',
'label' => Mage::helper('store')->__('Telephone'),
'title' => Mage::helper('store')->__('Telephone'),
'required' => false,
));
if (Mage::getSingleton("adminhtml/session")->getStoreBlock()) {
$form->setValues(Mage::getSingleton("adminhtml/session")->getStoreBlock());
Mage::getSingleton("adminhtml/session")->setStoreBlock(null);
} elseif(Mage::registry("store_block")) {
$form->setValues(Mage::registry("store_block")->getData());
}
return parent::_prepareForm();
}
}