minor refactor

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@74766 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
fix example in docstring

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxPython/Phoenix/trunk@74767 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775