Postboxes can be closed now

git-svn-id: https://plugins.svn.wordpress.org/gwolle-gb/trunk@1045747 b8457f37-d9ea-0310-8a92-e5e31aec5664
small fix for Postboxes

git-svn-id: https://plugins.svn.wordpress.org/gwolle-gb/trunk@1045749 b8457f37-d9ea-0310-8a92-e5e31aec5664