1. uninitialized variable in wxPanel fixed and unused one removed from wxWindow

2. wxTreeCtrl sends more notification messages


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@2826 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/generic/panelg.h

@@ -46,6 +46,8 @@ public:
             long style = wxTAB_TRAVERSAL | wxNO_BORDER,
             const wxString& name = wxPanelNameStr)
     {
+        Init();
+
         Create(parent, id, pos, size, style, name);
     }