Fixes issue in Simplex theme where shortcoder media button disappears after upgrading WordPress to 3.5. Former method was using media_buttons_context. That method was deprecated in 3.5. (http://core.trac.wordpress.org/ticket/22559) This file is located @Simplex/core/shortcoder/init.php

init.php

<?php

add_action('media_buttons' , 'ts_shortcoder_button', 11);

function ts_shortcoder_button(){
  $shortcoder_button_image = THEME_CORE_URL . '/images/shortcoder_icon.png';
	$shortcoder_button = ' %s';
	echo '<a title = "' . __('Insert a Shortcode' , TS_DOMAIN) . '" href="' . THEME_CORE_URL . '/shortcoder/shortcoder.php?init=true&TB_iframe=true&width=500" class="thickbox"><img src = "' . $shortcoder_button_image . '" /></a>';
}