a) implemented GetColumnCount() b) columns are always created with some reasonable (i.e. != 0) width 2. wxRadioBox: keyboard navigation now works inside it (almost) as it should git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@1821 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775