Removed redundancy
Heterogeneous array compatibility

Fixed bugs when setting/getting heterogeneous array containing a class
which overrides HG property and another which does not
Inactive during button callback

Dialog figure now goes inactive during button callback
Bug fix for EliminateEmptySpace behavior

Now supports HG objects with an hgwrapper object that override its
Visible property
Bug fix: Re: layout with vertical spanning
Bug fix

event.listener does not support HG-style set/get interface