Prevent tab stop

Hi everybody,

I am searching for a way to prevent tab stop on specific objects. I use three drop-down lists on my site. Depending on what is chosen in the first one, either the second or the third are displayed. Which works fine btw.

But when choosing an entry in the first list via arrow keys on the keyboard and then using the tab key and not the mouse, it could happen, that the tab stop chooses the wrong list. Is there a way to exclude the drop-down lists from the tab stop list?

Another solution would be, if I could set the focus to the now visible (second or third) drop-down list. But I was not able to find something like set focus.

We publish our Lectora files as .exe files. So any java scripts or something similar will not work as far as I know.

Thanks in advance!