Returns the Double value for
the extrapolation after the clip. The ExtrapolationAfter value
determine how a clip contributes to the animation afer the frames
on which it is defined. The different methods of extrapolation are
available from the TimeControl.ExtrapolationAfterType
property, so this value sets the number of extrapolation
units.
For example, if the type is a hold, then the value is interpreted
as the number frames to hold; if the type is a cycle, then the
value is interpreted as the number of times to repeat the clip; if
the type is a bounce, then the value is interpreted as the number
of times to repeat the clip forward and backward.
On the Time Control property editor, this value appears on the
Extrapolation tab.