notify the perisistence system of changes in subobjects by a dummy class variable affectation.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@4337 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Form/PDFForm.py

@@ -475,7 +475,9 @@ class PDFForm(File):
           %(cell_name, `TALES`))
       raise ValueError, 'TALES must be a string'
     self.all_cells[str(cell_name)] = self.cells[str(cell_name)] = TALES
-
+    # invalidate for persistence
+    self.all_cells = self.all_cells
+    
   security.declareProtected(Permissions.View, 'getCellTALES')
   def getCellTALES(self, cell_name):
     """ returns the TALES expression associated with this cell """