Fixed import

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@75406 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Use -1's for the default minsize

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@75407 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775