justify bbcode for vb.4.2

[aminp30]

hi guys

i need to add justify bbcode, but not as a custom bbcode.
I found the code in class_bbcode.php --> line 3542. and added this code

PHP Code:

// [JUSTIFY]
            $tag_list['no_option']['justify'] = array(
                'html'              => '<div style="text-align: justify;">%1$s</div>',
                'ignore_global_strip_space_after' => true,
                'strip_empty'       => true,
                'strip_space_after' => 1
            ); 


it works great by typing but I can't add button for it next to left align button. what should i do?