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action is not described

sidebar_admin_page action-hook . WP 1.0

This action is documented in wp-admin/widgets-form.php

Usage

add_action( 'sidebar_admin_page', 'action_function_name_5749' );
function action_function_name_5749(){
	// action...
}

Where the hook is called

In file: /wp-admin/widgets-form-blocks.php
sidebar_admin_page
wp-admin/widgets-form-blocks.php 79
do_action( 'sidebar_admin_page' );
wp-admin/widgets-form.php 565
do_action( 'sidebar_admin_page' );

Where in WP core the hook is used WordPress

Usage not found.