Fix crash on Mavericks and W8.1, for undo/redo of move attribute. [#107433676]
Fix crash on Mavericks and W8.1, for undo/redo of move attribute.
[#107433676]

concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap,concord-consortium/codap