Other events are blocked

When I use selectable, I can't use other event feature of jquery. I use selectable with jQuery.live in same element. Ex :

With this example I can select or unselect all div in my div but I can't display "I've clicked span in my div !" !!!

Code :

<div id="mydiv">
   <div>toto</div>
   <span>click here!</span>
   <div>titi</div>
   <span>click here!</span>
   <div>tata</div>
   <span>click here!</span>
   <div>tutu</div>
   <span>click here!</span>
   <div>tyty</div>
</div>
<script type="text/javascript">
$("#mydiv span").live("click",function(){alert("I've clicked span in my div !");});
$("#mydiv").selectable({filter:"div"});
</script>

I need to use live with selectable. I try to use jQuery.click or mouseup but it's the same problem when selectable is used...