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function customnotifications_component_addmenu($arg = null)
{
if (is_readonly_user(0)) {
return;
}

global $customnotifications_component_name;
$urlbase = get_component_url_base($customnotifications_component_name);

$mi = find_menu_item ( MENU_ACCOUNT, "menu-account-customtemplates", "id" );

if ($mi == null) {
return;
}

$order = grab_array_var($mi, "order", "");
if ($order == "") {
return;
}

$neworder = $order + 1.1;

add_menu_item(MENU_ACCOUNT, array(
"type" => "link",
"title" => _("Custom Notification Templates"),
"id" => "menu-account-customtemplates",
"order" => $neworder,
"opts" => array(
"href" => $urlbase . "/index.php"
),
"function" => "customnotifications_can_show_menu"
));
}

If your Nagios XI custom component is not appearing in the menu, the most common causes are incorrect configuration, missing or conflicting id values, or improper placement in the menu hierarchy.

Check the id in your component's registration script: Ensure the id is unique and correctly defined in the component.inc.php file. Duplicate or invalid id values can cause components to be ignored or override others.
Verify the add_menu_item function in inc.php: Use the correct menu constant (e.g., MENU_HOME) and ensure the id matches an existing menu item for proper placement. For example:
$mi = find_menu_item(MENU_HOME, "menu-home-tacticaloverview", "id");
if ($mi == null) return;

If the referenced menu item doesn’t exist, the component may fail silently.

• Confirm the component is uploaded and enabled: Go to Admin > System Extensions > Manage Components, upload your .zip file, and ensure the component is enabled and not disabled.
• Check for conflicting CSS or JS: If using Custom Includes, ensure no CSS rules are hiding the menu item. Also, verify that no existing component (e.g., Header-Solid.css) is conflicting with your custom styles.
  Review the Apache error log: Use tail -f /usr/local/nagiosxi/logs/httpd/error_log to check for PHP errors or file not found issues (e.g., missing image or script).
• Use the correct menu order: Components are added based on the order value. If the order is incorrect or conflicts with existing items, it may appear out of place or not load.
• Test with a minimal component: Create a simple component with only the add_menu_item function to isolate the issue.

For detailed guidance, refer to the official documentation:

• How To Write Custom Components For Nagios XI
• Nagios XI - Managing Components