We're going to use this command for our Rewind button; just like for the other buttons, right-click the Rewind button and select Actions before inserting the prevFrame command inside an on (release):
on (release) {
doorknobpage.prevFrame () ;
}
When used this way, the prevFrame command is relative; it doesn't require an absolute definition of frame numbers to reference in order to define the playback position, but instead uses the current frame position as its reference and skips back one from there. With this action assigned to our Rewind button, the user can take the video backwards frame-by-frame with each click.
