navigation – Links within an iPhone application

Imagine an iPhone application with a tab bar (5 elements) and a link to the user profile in the header.

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Now let's say you are somewhere in tab 5 and would like to create a link to a screen within the user's profile.

I feel that this is not a good practice. An application is not like a website and there are usually no links from one tab to another.

Do you know a way to avoid this? Or do you have any explanation as to why this is not a good practice within an application?

The only solution I can think of is to show the screen in a modal view, but this really does not work for me here.