fix 3-state checkbox api

git-svn-id: http://farmanager.googlecode.com/svn/trunk@11436 ea59307d-ff68-5b67-5a21-acd59c66a581
update headers to 3803

git-svn-id: http://farmanager.googlecode.com/svn/trunk@11437 ea59307d-ff68-5b67-5a21-acd59c66a581