tweeking a few Demos to work


git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@73550 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Adapted Group object to allow binding events to sub-objects.



git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@73551 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775