Webdynpro Chart Designer: cannot change series text size\style

Hello Experts,

we are using the Business graphics into a Java webdynpro application (DC).

We need to change the text size showed into the series of our charts.

Here the step by step (please see attachment):

Start Chart Designer > Series > Default Series > Text Properties:

here we tried to change the text size or the text style, but after Build and Deploy we cannot see any change in our application...

Are we missing something???

Best Regards,

AT