Silverlight Spy, FireBug type tool for Flex
apache-flex, debugging, firebug, flash, silverlight
Solution
De MonsterDebugger. It has an AIR app that acts like firebug, let you inspect/change variables, call public methods at runtime, etc. It is not Flex only, instead, you can use it in any as3 project.
reflexutil is for flex. But I haven't used it.
Also, I found the list of helpful Flex or Flash debug tools.
Problem
Is there a debugging tool for Flex that functions like Silverlight spy or FireBug?