[AS 2.0] Problem with removeMovieClip+setInterval

Question

For this movie, I'm showing a grid of symbols that appear,
pause, then fade, so I can have people try to identify them quickly
(for a psych experiment). I have a "Grid" that all of these
"GridSymbols" are children of (currently using the DepthManager,
but I'm pretty sure I had the same problem when I used
getNextHighestDepth).
I'm using a timer (via setInterval) to be able to dynamically
set a time for a movie to remain visible on the screen (there is a
5 frame fade-in, then a setInterval timer on a stop() frame that
after the time jumps to the fadeout frame). This works great until
I need to remove all of the currently visible movies to progress to
a new part of the task that I am creating. The offending code looks
like this (on frame 6, after the fade):
stop();
this.delayAmount = setInterval(goToFade,
_root.SymbolVisible);
function goToFade()
gotoAndPlay("fadeout_frm");
clearInterval(delayAmount);
The problem occurs when I remove the Grid (thus removing all
of the GridSymbols). If however I remove the delayAmount interval
and simply insert 10 static frames from 6 - 15 the program works
fine, so I feel confident that it has to do with the interval
(perhaps maturing after the movie has been removed and then looking
for the appropriate frame to jump to). Anyone have any idea how to
fix this? Or perhaps an alternate method of accomplishing the same
goal?
Thanks!

Answer 1

Ok, I've got a solution, though it might not be pretty. I'm
creating an array to hold the symbol instance names of all of the
movies that have the internal intervals running:
symbolIDArray[hPos+vPos*Horiz] =
CurrentGrid.createChildAtDepth("grid_symbol", DepthManager.kTop);
Then, when I need to delete, I run this quick loop:
for (i = 0; i < symbolIDArray.length; i++)
clearInterval(symbolIDArray
.delayAmount);
Once the loop has finished, the movies can be removed
without problem. :)