anchordocking: comment

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@39778 4005530d-fff6-0310-9dd1-cebe43e6787f
LCL: published TListBox.ItemIndex, TCheckListBox.ItemIndex

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@39779 4005530d-fff6-0310-9dd1-cebe43e6787f