Problem playing through the timeline and stoping at a tag

Hi!

This might be a really dumb question, but I'd like have a button start and stop at predetermined tags on the timeline.

I tried this:

sym.getComposition().getStage().getSymbol("MySymbol").play(0).stop("en d");

and when I click the link it jumps right to the "end" tag, and doesn't run through the timeline and stop at the "end" tag.

Any idea what I'm doing wrong? Thanks in advance!