Display custom meta box to the admin sidebar not working - wordpress

Question

I created a custom meta box to display some content inside the post display in the admin area and want it to show in the sidebar instead of below the wysiwyg editor. I added "side" to the context but nothing happens! I've been playing with this for many hours and haven't had any luck.
This is my code:
function add_custom_meta_box() {
add_meta_box (
'custom_meta_box',
'Custom Meta Box Title',
'show_custom_meta_box',
'post',
'side',
'high'
);
}
add_action('add_meta_boxes', 'add_custom_meta_box');
function show_custom_meta_box() {
// here i have all the code
}

Answer 1

Adapted from this Q&A, the following will force the custom meta box into the second position in the side column.
Check the comments and note the caveat for admin_init.
It only works if the user hasn't rearranged the positions himself. When registering a new user, the position is set for him, as the hooks admin_init and user_register are attached to the same callback function.
// This fires at **every** page load, a better hook must be found
add_action( 'admin_init', 'set_user_metaboxes_so_14183498' );
// This fires when a new user is created
add_action( 'user_register', 'set_user_metaboxes_so_14183498' );
function set_user_metaboxes_so_14183498( $user_id = null )
{
// This is the metakey we will need to update
$meta_key = 'meta-box-order_post';
// So this can be used without hooking into user_register
if( !$user_id )
$user_id = get_current_user_id();
// Set the default order if it has not been set yet by the user.
// These are WP handles, PLUS our custom meta box handle
if ( ! get_user_meta( $user_id, $meta_key, true ) )
{
$meta_value = array(
'side' => 'submitdiv,custom_meta_box,formatdiv,postimagediv',
'normal' => 'postcustom,commentsdiv,slugdiv,revisionsdiv',
'advanced' => '',
);
update_user_meta( $user_id, $meta_key, $meta_value );
}
}