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Abrir o ficheiro Display.template.php
Pesquisar por
<input type="submit" name="preview" value="' . $txt[507] . '" onclick="return submitThisOnce(this);" accesskey="p" tabindex="4" />
Adicionar este codigo
<input type="button" value="Editor Avançado final" onclick="parent.location=\'', $scripturl, '?action=post;topic=', $context['current_topic'], '.', $context['start'], ';num_replies=', $context['num_replies'], '\'" />