[Robert Bale]

I have the same question, i know this, Select the project, and in the Timeline, place the playhead at the frame you want to save, and choose Share > Save Current Frame.But i use to load footage into the view / then go SHIFT N, that would make a freeze frame of the video, then you could drag it into the time line, i found this in the i movie help – skim your playhead to any point in a video clip that you want to capture as a still image. Right-click and choose “Add Still Frame to Project” from the menu that pops up. iMovie automatically creates a still frame and ads it to the end of your project.

All we want to do is Crab a still, from the video, it would be good if apple would add it to fcpx so once you freeze a frame it auto adds it to the event library.