Activity form outside of activity page

I'm trying to get an activity form to show up outside of the activity loop itself. Just as you might have on twitter, I have a button in the header that calls the form, which works fine.

The only thing is, the BP activity + options don't show up at all. The only place they show up is when in the activity page, so i'm guessing this has smtg to do with the loop ? or with actions in the header ?

i'm a bit lost here..