ActionScript 3.0, Adobe Flex

Adobe Flex : Never try to removeChildren() that are defined in MXML

This is a mistake that sometimes works when you try it but in most cases this just causes a lot of heartache. Usually the heartache occurs after you have been doing this for a while and you then have to go back and fix a lot of code that was dependent on the first removeChild(). Unfortunately I have seen this first hand and its not a pretty sight. If you are doing a lot of children manipulation then you will want to move away from MXML declaration and handle the children creation/removal all in ActionScript.

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