added interface headers with latest discussed changes

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@52381 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/tracker.h

@@ -0,0 +1,37 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        tracker.h
+// Purpose:     documentation for wxTrackable class
+// Author:      wxWidgets team
+// RCS-ID:      $Id$
+// Licence:     wxWindows license
+/////////////////////////////////////////////////////////////////////////////
+
+/**
+    @class wxTrackable
+    @wxheader{tracker.h}
+    
+    Add-on base class for a trackable object. This class maintains
+    an internal linked list of classes of type wxTrackerNode and
+    calls OnObjectDestroy() on them if this object is destroyed.
+    The most common usage is by using the wxWeakRefT
+    class template which automates this. This class has no public
+    API. Its only use is by deriving another class from it to
+    make it trackable.
+    
+    @code
+    class MyClass: public Foo, public wxTrackable
+    {
+       // whatever
+    }
+    
+    typedef wxWeakRefMyClass MyClassRef;
+    @endcode
+    
+    @library{wxbase}
+    @category{FIXME}
+*/
+class wxTrackable 
+{
+public:
+    
+};