Start external app/Activity and add my own header?

I am using Sygic Navigation on my HTC Hero. I can start it by calling the correct intent as I described here. Now, Sygic starts in fullscreen-mode and I cannot use the BACK-button to go back to my previous Activity (don't ask me why).

The question is: is there some trick or way so I can control how that Sygic Activity is started? I want to add my own "header" on top; the header contains my buttons for navigation. It would be great if I could add that header, then have Sygic below that (as the "co开发者_开发技巧ntent" then, as shown here).

---

Now, Sygic starts in fullscreen-mode and I cannot use the BACK-button to go back to my previous Activity (don't ask me why).

Aw, c'mon! Please can I ask why? Pretty please? :-)

The question is: is there some trick or way so I can control how that Sygic Activity is started? I want to add my own "header" on top; the header contains my buttons for navigation. It would be great if I could add that header, then have Sygic below that (as the "content" then, as shown here).

No, sorry.