What happened to Exclude from Source Control

I remember that in the past I was able to Exclude selected files from Source Control. But now this is missing:

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How do I get it back. I want to exclude permanently, for example the photos folder.

Solution

This feature can now be found in the Pending Changes window:

You must first undo any pending changes on this item if there are any.

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And you can specify a .tfignore in your source control system to make TFS automatically ignore files (the above mentioned dialog will create or update this file through the UI)