imovie 11 freeze frame for picture in picture

Is it possible to capture a still image from a video clip and insert it as a picture in picture on a video clip.

Getting the still frame is straightforward. After its created in the main flow of video I tried dragging it over another clip for PIP but it appears that won't work.

In Previousl versions of iMovie it appears that there was a menu option to reveal a still frame in the finder but that option appears to have been removed for iMovie 11.

Is there a way to get a still frame into PIP preferably inside of iMovie 11.

Thanks.