InlineGraphicElement isn't render after scroll textarea

I'm using text area (spark) to display some paragraphElement which contain InlineGraphicElement.

inlineGraphicElement.source = sprite (an instance of Sprite class).

sprite is addChild a swf movie (AVM1 movie, use AVM2Loader to add to sprite), that mean inlineGraphicElement.source is dynamic.

When VScroll of textArea visible, and I scroll it so the inlineGraphicElement is out of viewport, then I scroll back.... my inlineGraphicElement is disappear.

I don't understant, I have trying with gif Image (use GifPlayer class product by ByteArray site), the same error still occur, please help

thanks for ur help!!