Problem with tooltip on Link to Action columns

Hi all,

I have a problem with tooltip when the user does mouseover on Link to Action colums of order list.

I have a column of Link to Action type, this column is configured as below:

When the user go on mouse over this column, the fpm open a window that shows a large version of image contained in Image Field:

I would like to remove all behavior on mouse over: I would like to remove the large image but even the system tooltip "Get PDF".

If I try to leave blank the Tooltip field in configuration, the fpm shows anyway a system tooltip that I don't like.

Thanks in advance,

Francesca