getSelection() is not working in IE?

          
var current_editor = "your_editor_name";

if(CKEDITOR.env.ie)
{
  CKEDITOR.instances[current_editor].getSelection().unlock(true);
  var selected_text = CKEDITOR.instances[current_editor].getSelection().getNative().createRange().text;
}
else
{
  var selected_text = CKEDITOR.instances[current_editor].getSelection().getNative();
}

// So no you can use it to replace something for instance, like I want to do in a custon plugin i've made.
CKEDITOR.instances[current_editor].insertHtml('[foo]' + selected_text + '[bar]');