[Plugin: Shortcodes Pro] No button available in TinyMCE

Hello,
I’m just trying the Shortcodes plugin but have an issue :
I have created a shortcode following the documentation. I can find it when I am in the shortcodes page but nothing appears in TinyMCE editor. When I select the rich editor sort page, nothing appears!
So, I’m unable to use it!
Do I need to make something special ?
Many thanks

http://wordpress.org/extend/plugins/shortcodes-pro/