I'm not sure if this will be a popular opinion or not, but...
If it works during run time, great. Don't worry about design mode.
Deal with whatever inconvenience that causes. Design Mode != Flash
Player. It is intended for layout. It is not intended to handle things
like on-the-fly resizing that are normally done by processing code
behind the scenes.
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I agree with Jeffry. I primarily work in source mode in Flex Builder because while Design Mode seems to offer advantages, it just slows me down, and does not do much of what you expect it to do.
In your case, because you are doing custom AS coding, that kind of thing often will simply not be reflected in Design Mode. Just have to accept it, launch the app, refresh as you change the app, and the launched app is your "Design Mode".
To a certain degree I agree with both of you but I'm not working on a company project yet, I'm still learning flex and actionscript.
As I'm still learning and I know it can be done, I would like to know how to do it, so if anyone knows how to do what I'm asking I would be very grateful for your help.
Thanks in advance,
I've figured it out for myself.