public function add_sub_page() {

		$this->screen_hook_suffix = add_submenu_page(
			$this->struct['args']['parent'],
			$this->struct['args']['page_title'],
			$this->struct['args']['menu_title'],
			$this->struct['args']['capability'],
			$this->slug,
			array( $this, 'create_page' )
		);

	}
public function add_sub_page() {

		$this->screen_hook_suffix = add_submenu_page(
			$this->struct['args']['parent'],
			$this->struct['args']['page_title'],
			$this->struct['args']['menu_title'],
			$this->struct['args']['capability'],
			$this->slug,
			array( $this, 'create_page' )
		);

	}
public function add_sub_page ( ) { $ this -> screen_hook_suffix = add_submenu_page ( $ this -> struct [ 'args' ] [ 'parent' ] , $ this -> struct [ 'args' ] [ 'page_title' ] , $ this -> struct [ 'args' ] [ 'menu_title' ] , $ this -> struct [ 'args' ] [ 'capability' ] , $ this -> slug , array ( $ this , 'create_page' ) ) ; }
Add the sub settings page

@since 1.0.0
@access public
@uses "admin_menu" hook
Add the sub settings page