Figuring out how to trigger an event when a component is visible on screen?

Hey guys, I got this arraycollection i'm setting on TAB 1 of
my tab navigator. I'm using this array collection as a dataprovider
for my grid on TAB 2. I dynamically add rows with an AS function
and that seems to work fine when i click on a button on tab 2.
However, I want my function to get called everytime i switch
from tab 1 to tab 2.
It seems simple enough but some events seem to run the
function more than once and that probably isn't the most efficient
way like the render event or updateComplete.

also, what I'm noticing is if i have:
-main application Tab Navigator with 2 canvases
-- Canvas1
---componentA
---componentB
--Canvas2
---ComponentD
---ComponentE
the show event registers for Canvas1 and 2 but never
dispatches for the canvas inside of any of the components?? Any
ideas?

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