Flash component incompatibilities Mx/MX2004 HELP

Hello…
I’ve just finished building my component,
and i follow a tutorial “CREATE A SIMPLE FLASH MX COMPONENT”

but now i have a problem…
i follow that tutorial i start developing my component based on

#initclip
myComponent.prototype = new MovieClip();

etc…

i i build the SWC file, but now when i try to use the component on MX2004 it doesnt work!! and now i read that mx2004 componets have a new archichecture…

Does anyone knows why didnt this work on flash mx2004

Do i have to build it again using the new MX2004 archichecture?!

Best regards