[flexcomponents]Running effects in steps

[dorkie dork from dorktown]

I am trying to get an effect like a wipe right effect to increment in custom
step size rather than single pixels. For example, I want to show or reveal a
link bar one link item at a time over 1 second. I thought maybe I could use
the Wipe effect and pass in the size of the link items to a step property.
So I would set the step size to 100 pixels and the mask would show the first
100 pixels wait and then show the the second 100 pixels and so until the
effect finished.