Added VC++ project files for remaining Gizmo samples

Corrected some precompiled header issues for dynsash samples
Corrected IMPLEMENT_ABSTRACT_CLASS in multicell.cpp
Added an event function typedef and used it in dynsash sample


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@14475 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

contrib/samples/gizmos/dynsash_switch/dynsash_switch.cpp

@@ -12,6 +12,19 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
+// For compilers that support precompilation, includes "wx/wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+// for all others, include the necessary headers (this file is usually all you
+// need because it includes almost all "standard" wxWindows headers)
+#ifndef WX_PRECOMP
+    #include "wx/wx.h"
+#endif
+
 #include <wx/app.h>
 #include <wx/frame.h>
 #include <wx/choice.h>