lock style tag

Hi,

a little request : is it possible to lock a style tag ?

For instance, copy this code in the editor :

<style style="display: none;" type="text/css">
p { font-weight: bold; }</style>
<p>
   Foo</p>

Return to the wysiwyg, select all the content and delete it. If you go to the source... everything disapeared, even the style tag.

Thanks for reading and maybe answering