class My_Module_Block_Adminhtml_My_Template extends Mage_Adminhtml_Block_Template { protected function _toHtml() { return 'Hello World!
'; } }
class My_Module_Block_Adminhtml_My_Template extends Mage_Adminhtml_Block_Template { protected function _toHtml() { $collection = Mage::getModel('my_module/my_model')->getCollection(); $html = '