Problem with <pre> Tag

Hi, if I use a <pre> Tag and I put some <hr> in it, ck does not right support it.

Example

<pre>
test 
test
</pre>

If I try to make a <hr> between test and test CKE split it like

<pre>
test 
</pre>

<hr />
<pre>

test</pre>

what can I do that CKE don't can the code between a <pre> Tag ?

regads Conny