Creating a Framework for iOS

I’ve some problem with adding KnobControl.xcodeproj as a sub-project. When I add xcodeproj there isn’t any way to expand the KnobControl project to see the Products folder…There is not any arrow on the left of KnobControl project…
How do I do that ?

ok I resolved it.
I must close KnobControl project before to add it to KnobShowcase

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