Multiple line property in Navigation Button

Hi.

Using NOF 8 i'm trying to use the multiple line property of the 
navigation button.

I have created a new style for a site starting from a blank style and 
the text of the button menu are very long. So i use the flag "Multiple 
line" in the property palette to have two lines of text in the button.

I also tried to change the size of the button to be higher enough to 
contain two lines of text.

Unfortunately the text is always truncated after the first line.

Suggestions ??