Hey Rick,
How are you calling your ttwtih_create_menu_item() function? I tested your code on a Thesis 1.7 install and it worked fine for me. Make sure you are using the admin_menu action hook to register your submenu like so:
PHP Code:
add_action('admin_menu', 'ttwtih_create_menu_item');
So the full code snippet would be:
PHP Code:
add_action('admin_menu', 'ttwtih_create_menu_item');
function ttwtih_create_menu_item(){
add_submenu_page('thesis-options', __('Image Header', 'thesis'), __('Image Header', 'thesis'), 'edit_themes', __FILE__, 'ttwtih_settings_page');
}
function ttwtih_settings_page(){
?>
<div id="thesis_options" class="wrap">
<?php
thesis_version_indicator();
thesis_options_title(__('Image Header Options', 'thesis'));
thesis_options_nav();
?></div>
<?php
}
Place the above code in your custom_functions.php Thesis file and the menu will work perfectly.