Added SetProperty with wxChar* argument

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74982 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Corrected conversion of small dimensions to pixels

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74983 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775