Animation show and hide

[dobu84]

Hi,

I'm trying to modify the show and hide method cause I would like to have a view appearing from top to bottom, like a spinner view in android.
It seems that the dropdown view appear from midX and midY and scale to his final width and height.
I'm trying to figure it out how works the DropDown method and I also tried to use the ".animationEntranceOptions" but without any success.

Thank's in advance for your help.