Animated Panel in Google Web Designer

I'm trying to make a Drop Down Menu when the mouse entered just like the following example.

First I tried to simply add a Drop Down Menu component but I can't find any example teaching me how to set it up.

I then tried to add a Element and throw a bunch of Text field in it as a group. And tried to change the visibility of the group in the MouseEnter event. But I can NOT find anything online teaching me how to do it!

Could somebody be so kind and teach me how-to please!?

It will be even better if somebody have a better way to do it!

Much appreciated!!!