This is a function to do it easily: This might be better: http://scribu.net/wordpress/custom-sortable-columns.html
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Feature image is missing in the WP admin sidebar
For me, “Featured Image” was still missing from the Screen Options tab, even after clearing the cache and restarting the browser. In my case the problem was related to having a WordPress 3.2 Multisite install. With this setup, the Media upload buttons must be checked in Network Admin to enable the featured image meta box Full Article…