I think you need to do something like the below.
# Click tst to make the menu appear
a.span(:text = 'tst').click
# This will intelligently wait for the new menu item to be available and
then click on it.
a.span(:text = Activar).when_present.click
On Wednesday, February 26, 2014 9:30:51 PM
Hi,
You can also try to use a hover method. A while back fire_event worked.
However. This is what one user does, that may work for you.
http://stackoverflow.com/questions/9272533/watir-fire-event-is-not-working-where-as-click-works-fine-in-ie
On Wednesday, February 26, 2014 7:30:51 PM UTC-7,