In search of advice for a Flex application

I'm trying to describe my plan as simply as I can but I may
fail.
My project group is working on a designing application for
garages. User can drag and drop elements (window, wall, doors) to a
canvas area to create a garage design. I can't tell more because
it's a business secret. ;) Could someone help me how to create a
feature that if user hasn't created valid entity (for instance
pieces of wall are missing and thus the garage won't function
properly because chilling wind is let inside and the roof can't be
placed on the construction) our application draws a red line to
empty spots marking an error. Also an alert/message box should
appear and tell the user what's wrong with his/her design. I
suppose that this could me made by using degrafa but feel free to
suggest better options.
I would very much appreciate if somebody knows an existing
application which has same kind of feature which I could use as
help. Thanks beforehand!
//John

quote:
Originally posted by:
robbyk87
I reccommend checking out the seemingly infinate number of
games/apps that are created using basic flash - plenty of those use
techniques you have described - and most of which can be applied
using the actionscript in flex or even AIR as it sounds more like a
desktop based project.
Thanks a lot mate. That's pretty much I considered an useful
way to create such feature. I would extra appreciate if you know
some applications which use before-mentioned techniques. Searching
for one hasn't yet come up with anything.

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In search of advice for a Flex application

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