input handler should coreesponding the widget instance, wxListBox and wxCheckListBox has its own input handler, so create it differenctly

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77840 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/univ/listbox.h

@@ -261,6 +261,10 @@ protected:
     // and this one the client data (either void or wxClientData)
     wxArrayPtrVoid m_itemsClientData;
 
+    // this is hold the input handler type. the input handler is different
+    // between ListBox and its subclass--CheckListbox
+    wxString m_inputHandlerType;
+
     // the current item
     int m_current;