This has been bugging me for a while. In Xcode 4, sometimes this menu item is enabled, sometimes it is disabled. I cannot figure out why it is ever disabled, and there seems to be nothing at all on Google about this.
I have this same problem. If I click on the "Show assistant editor" button (the middle button in the list of Editor buttons located in the upper-right hand corner) and then back again to "Standard Editor" (the left-most button in the list of Editor buttons) then the "Find selected text in workspace..." function is enabled. But I have to do this often, but only in the projects I created before Xcode 4. So I think some setting in the project was not created properly when Xcode 4 converted it over.
I have found if you just right click on the word, without selecting it prior, then the menu selection will be enabled. This seems to be more prevalent in xCode 4.4.1. I have also noticed that when you select other words will "trigger" the menu to enable also. Hope this helps.
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