Finding clips

[Franz Diwischek]

I am often warned before rendering that individual clips are offline and may be rendered with the proxies. I would like to have a button that highlights all media in the timeline that are offline, e.g. with a small red flag.
In Adobe After Effects, I can right-click on a medium in the project window to find out in which compositions this medium was used. I would also like this for Premiere Pro in relation to the timeline.