table & SetBGColor

I want the default font background to be yellow when I edit a document (stored in SQL server), I use the following code

editorWPRichText.WritingAttr.SetBGColor(clYellow);

this works well in documents generally but if the document has a table in it the font background does not change and the default behaviour occurrs.

How can I make this WritingAttr work for all of the document?

Ithanks for the reply - I probably didn't make the request clear.

I only want the amended (edited) text to have a coloured background - this is so that when the document is returned to the author they can see the changes made (these will generally be added text).

Using the write attribute works well apart from within the part of the document that is composed of tables where the default behaviour occurs.