Loosing on.keyup after setdata

Hi,

I'm having a problem with the setdata(). I have a config like :

...

        instanceReady : function( ev )
        {
          this.document.on("keyup", function(event){
            if (event.data.getKeystroke() == 13)
            {
              sendmessage();      
            }
          }),

and in the sendmessage :

      CKEDITOR.instances.message.setData('');

after this setData the keyup event doesnt work anymore....

any ideas?

tks