Hey !
After 4 hours searching how to, i've found ! héhé
So, EDIT the file : [YOUR SMF]/Themes/[YOURTEMPLATE NAME]/index.template.php
FIND ::::
// Work out where we currently are.
$current_action = 'home';
if (in_array($context['current_action'], array('admin', 'ban', 'boardrecount', 'cleanperms', 'detailedversion', 'dumpdb', 'featuresettings', 'featuresettings2', 'findmember', 'maintain', 'manageattachments', 'manageboards', 'managecalendar', 'managesearch', 'membergroups', 'modlog', 'news', 'optimizetables', 'packageget', 'packages', 'permissions', 'pgdownload', 'postsettings', 'regcenter', 'repairboards', 'reports', 'serversettings', 'serversettings2', 'smileys', 'viewErrorLog', 'viewmembers')))
$current_action = 'admin';
if (in_array($context['current_action'], array('search', 'admin', 'calendar', 'profile', 'mlist', 'register', 'login', 'help', 'pm')))
$current_action = $context['current_action'];
AFTER ::::
// Work out where we currently are.
$current_action = 'home';
if (in_array($context['current_action'], array('admin', 'ban', 'boardrecount', 'cleanperms', 'detailedversion', 'dumpdb', 'featuresettings', 'featuresettings2', 'findmember', 'maintain', 'manageattachments', 'manageboards', 'managecalendar', 'managesearch', 'membergroups', 'modlog', 'news', 'optimizetables', 'packageget', 'packages', 'permissions', 'pgdownload', 'postsettings', 'regcenter', 'repairboards', 'reports', 'serversettings', 'serversettings2', 'smileys', 'viewErrorLog', 'viewmembers')))
$current_action = 'admin';
if (in_array($context['current_action'], array('search', 'admin', 'calendar',
ADD :::::
'shop',
RESULT :::::::::::
// Work out where we currently are.
$current_action = 'home';
if (in_array($context['current_action'], array('admin', 'ban', 'boardrecount', 'cleanperms', 'detailedversion', 'dumpdb', 'featuresettings', 'featuresettings2', 'findmember', 'maintain', 'manageattachments', 'manageboards', 'managecalendar', 'managesearch', 'membergroups', 'modlog', 'news', 'optimizetables', 'packageget', 'packages', 'permissions', 'pgdownload', 'postsettings', 'regcenter', 'repairboards', 'reports', 'serversettings', 'serversettings2', 'smileys', 'viewErrorLog', 'viewmembers')))
$current_action = 'admin';
if (in_array($context['current_action'], array('search', 'admin', 'calendar', 'shop', 'profile', 'mlist', 'register', 'login', 'help', 'pm')))
$current_action = $context['current_action'];
THEN,
FIND ::::
// The [calendar]!
if ($context['allow_calendar'])
echo ($current_action=='calendar' || $context['browser']['is_ie4']) ? '' : '' , '
<li class="' , $current_action == 'calendar' ? 'current' : '' , '"><a href="', $scripturl, '?action=calendar">' , $txt['calendar24'] , '</a></li>';
AFTER, ADD ::::
// SMFshop
echo ($current_action=='shop' || $context['browser']['is_ie4']) ? '' : '' , '
<li class="' , $current_action == 'shop' ? 'current' : '' , '"><a href="', $scripturl, '?action=shop">Shop</a></li>';
SAVE and UPLOAD your index.template.php
AND IT WORKS !