Include only part of a figure caption within a textbox in a table of figures in MS Word

I am writing a thesis paper with long figure captions. I have discovered how to use Style Separator to have only the first sentence appear in the list of figures, however all my captions are in text boxes, and Style Separator does not seem to work in those.

Does anyone know of a way to get this result within a text box? I'm using Word 2007.


Style Separators can be inserted into regular text and then cut and pasted into the text box, giving the same effect.