Next button in symbol, start animation from the timeline

Hello,

I have a next button in a symbol. When I click on the button I would like to start the animation from the timeline.

I have a code that works when the button is not in a symbol.

var pos = sym.getPosition()

if (pos <= '1000'){

          sym.play(1001);         

}

else if (pos <= '2000'){

          sym.play(2001);

I've tried different things but I can't get it to work. Like this:

var pos = sym.getPosition()

if (pos <= '1000'){

         sym.getComposition().getStage().sym.play(1001);

}

Can anybody help me with the code?

Thanks!