what is the difference between invalidateList and invalidateDisplayList?

Question

I have a DataGrid, populated with objects in an ArrayCollection. After updating one of the objects\' fields, I want the screen to update. The data source is not bindable,

Answer 1

invalidateDisplayList() merely sets a flag so that updateDisplayList() can be called later during a screen update. invalidateList() is what you want.

http://livedocs.adobe.com/flex/2/langref/mx/core/UIComponent.html#invalidateDisplayList()