hide with visual effect

[Mike Kerner]

I am trying to give the user the illusion that a dialog is sliding into
view and out of view.  The dialog is a rectangle graphic background, with
controls.  Showing it is easy - show x with visual effect scroll up very
fast.  When I want to hide it though, hide x with visual effect scroll down
very fast instead shows the underlying card moving, not the group that
represents the dialog.  I could write a loop to physically move the dialog,
but that doesn't seem ideal.

-- 
On the first day, God created the heavens and the Earth
On the second day, God created the oceans.
On the third day, God put the animals on hold for a few hours,
   and did a little diving.
And God said, "This is good."