public function getHeaderHtml()
{
$items = $this->getActiveChannelItems();
$data = array('target_css_class' => 'listing-profile-title', 'style' => 'max-height: 120px; overflow: auto; width: 200px;', 'items' => $items);
$dropDownBlock = $this->getLayout()->createBlock('M2ePro/adminhtml_widget_button_dropDown');
$dropDownBlock->setData($data);
// ---------------------------------------
return parent::getHeaderHtml() . $dropDownBlock->toHtml();
}
