If you’d like to override the default Design Options admin page, you can do so by adding a design_admin() method to your Skin.
Simply include this method in your Skin, and then echo the HTML output for your custom Design Options admin page:
public function design_admin() {
echo "This is my custom Design Options admin page output.";
}
Important! If you supply your own Design Options admin page, you’ll also need to handle the saving of your design data.