AS3 Button to link within nested MovieClip

I have a project using the “presentation template”. It’s set up with slides_mc that holds 4 keyframes. Each keyframe has its own movie being each slide. So, keyframe one has mc “slide1871”, keyframe 2 has mc “slide1903”, and so on. The presenter wants a button for each date to easily go from slide 4 back to slide 2 on one click. I’ve got this code on the first button, which works when it’s playing on that mc, but not on any other mc (ex. slide1903).

btn1871.addEventListener(MouseEvent.CLICK, fl_MouseClickHandler_2);
     function fl_MouseClickHandler_2(event:MouseEvent):void