Tweaks for ComboCtrl and demo

git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@77077 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@77078 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@77079 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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git-svn-id: http://svn.wxwidgets.org/svn/wx/wxPython@77080 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775