WPF 4.0. What's new? Part 5

The last article in the series is what's new in WPF. Links to previous versions in the original article. In this part there will be a small hodgepodge of innovations still found and excavated. I suppose that you can find others, but already these are not completely necessary in production, therefore, perhaps, it is time to stop.
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UPD Wanted to make a topic link, but forgot to choose, so that's it.