When my xcode load I see such panel of elements:

But when I click on any file in project this panel disapear and apper this panel:

After that I can’t open extended version of elements no way to add them in xib file. How can I open it?
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There’s a huge difference between the object library available for Cocoa and for Cocoa Touch. The “extended” elements you speak of are only available for OSX development.