TWPRichText field traversal

Hi,

I need to traverse through all the mergefields in the text in my TWPRichText to change some of the field texts.
Is there any way I can do that? I can only find TWPRichText.GetFields, which gives me a readout of the existing field texts, but doesn't allow me to change anything. I was hoping for something like:

for I := 0 to WPRichText1.Fields.Count - 1 do
WPRichText1.Fields[I].Text := 'blablabla';

Regards,
Bas

My post was unclear. I do NOT want to merge, I want to change the text of the merge fields, not replace them.

The fields in my rtf form look like this:

{\field{\*\fldinst{MERGEFIELD Banner;decimals=.,0 }} \plain\f2\fs20\cf0\i <Kopje>}

I use the field code "Banner;decimals=.,0" to format the text during mailmerge. This works fine.

But, when loading a form. I want to be able to update the displayed text "<Kopje>". Banner is the fieldname in the database, 'kopje' is a translation of that and when the user switches languages, 'kopje' needs to be retranslated.

Is there any way of doing this?

Regards,
Bas