Target mc in specific frame of main stage

I have two movie clips on the main stage:
mcNav and mcContent1 (mcContent1 is located in the 2nd frame).

When I click btn1 which is a movie clip within mcNav, I want to go to the 2nd frame on the main stage where mcContent1 is located.

And then go to frame 10 within mcContent1 and stop.

Here’s what I have:

btn1.onRelease = function() {
_root.gotoFrame(2).mcContent1.stop(frame 10);