public function showAction()
    {
        $this->html->h2($this->getTopicTitle());

        $context = $this->_getParam('id', 'gems');
        $this->_upgrades->setContext($context);
        if ($info = $this->_upgrades->getUpgradesInfo($context)) {
            $this->html->table(array('class'=>'browser'))->tr()
                ->th($this->_('Context'))->td($info['context'])
                ->tr()
                ->th($this->_('Level'))->td($info['level']);
            $data = $this->_upgrades->getUpgrades();
            foreach($data as $level => $row) {
                foreach($this->menu->getCurrent()->getChildren() as $menuItem) {
                    if ($menuItem->is('allowed', true)) {
                        $show = true;
                        if ($level <= $info['level'] && $menuItem->is('action','execute-to')) {
                            //When this level is < current level don't allow to execute from current level to this one
                            $show = false;
                        }
                        if ($level <= $info['level'] && $menuItem->is('action','execute-from')) {
                            //When this level is < current level don't allow to execute from current level to this one
                            $show = false;
                        }
                        if ($show) {
                            $row['action'][] = $menuItem->toActionLinkLower($this->getRequest(), $row, array('from'=>$level, 'to'=>$level));
                        }
                    }
                }
                $row['level'] = $level;
                $data[$level] = $row;
            }
            $displayColumns = array('level' => $this->_('Level'),
                                    'info'   => $this->_('Description'),
                                    'action' => $this->_('Action'));
            $this->addSnippet('SelectiveTableSnippet', 'data', $data, 'class', 'browser', 'columns', $displayColumns);
        } else {
            $this->html[] = sprintf($this->_('Context %s not found!'), $context);
        }

        if ($parentItem = $this->menu->getCurrent()->getParent()) {
            $this->html[] = $parentItem->toActionLink($this->getRequest(), $this->_('Cancel'));
        }
    }