I can only make assumptions on how you are doing your menu. As you have not posted the project.
So here is and example of how I would do it. The Menu elements drop down using a timeline triggered by the Mouse events.
All the Menu Elements are inside a Group. (Which is effectively a containing div).
The Mouse Events are triggered by the Groups Mouse over/out. Which means all the menu elements will be inside the Mover/out events
DropDownMenuExample.hypetemplate.zip (22.0 KB)