First think that comes to my mind is EditBox and ListBox. In EditBox let the user write His/Her own text, in List box you populate all avalable fields. When user DblClick on listbox field just insert the name with < < and > > in the EditBox at the position of EditBox.SelStart.


>Hi guys,
>
>We have a client who sents out email to their contractors when they processed the invoices. And they would like our app to generate email subjects like the example below:
>

>Your invoice #1234 has been proccesed on 12/16/2005
>

>
>Naturally, we would like to give the user the power to edit it to suit their needs (because we know what happens when we give a mouse a cooky), so we plan to store a script in a field of our system table, the field is called "gensubject" and the value would be like:
>

>Your invoice <<Invoice.number>> has been proccesed on <<date()>>
>

>
>How do I expose this script to the user for editing?
>What kind of interface would be appropriate?
>
>How do I let the user enter the script that's between <<>> without complaining about how complicated this is and without mistakes?
>
>Has anybody done this before?
>
>Any feedback and suggestions will be greatly appreciated!