Dynamic text behind a mask

Hi,

I’ve been trying to dynamically change some text for a titlebar that is behind a mask

However, I find that when I change the text of the dynamic text field (whose containing movieclip is masked by a graphic), the text no longer appears at all.

When i remove the masking, the text changes properly when asked, but when it it masked, the text does not show at all.

Is this a known issue?

Thanks,
Chris