How to refresh the overlays while the video clip is paused

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How to refresh the overlays while the video clip is paused

Description

When the video clip is paused, the overlays are not refreshed by default, so the OnFrameOverlayUsing... events do not occur.

Invoke RefreshPlayerOverlays and TVideoGrabber will raise the OnFrameOverlayUsing... events and refresh the video frame with the updated overlays.

Look at the "free hand drawing" sample code in the OnFrameOverlayUsingDC event of the MainDemo project.