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