patch from Dimitri fixing a few memory leaks and unTABbing the sources

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@14660 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

samples/treelay/treelay.h

@@ -12,8 +12,9 @@
 // Define a new application
 class MyApp: public wxApp
 {
-  public:
-    bool OnInit();
+public:
+    virtual bool OnInit();
+    virtual int OnExit();
     void TreeTest(wxTreeLayoutStored& tree, wxDC& dc);
 };