How to open the Drop Down List on the "enter" event?

I am trying to find a way for the users to see the expanded drop down list options without using their mouse to click on the down-arrow.
I am able to add script to the "enter" event so when user key-broad-tabbed into the drop down field, the first items of the list shows up:
dropdown1.selectedIndex = 0
However, it would be nice if at the same time, they can also see the rest of the options within the drop down expanded.
Any help/hints would be appreciated
Thanks in advance
p

It would even be nice if the PDF could default with the small arrow already displaying instead of having having to click the field, then click the arrow. I'm just hoping adobe would add this in a future version.

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