ActionScript3 + Yahoo! Astr - Distribucija komponenti - problem sa Button komponentom

[Charles Vane]

Imam seldeci problem:

Razvili nekoliko as3 class-a, koje se oslanjaju na Yahoo Astra flash biblioteku.
Zatim smo kreirali komponentu (symbol) koja nasleduje jednu od tih naših klasa.
Odlucili smo da distribuiramo tu našu komponentu u obliku mpx ekstenzije. Znaci
eksportovali smo komponentu u swc file i napravili ekstenziju.

Ukoliko zatim upotrebimo komponentu u novom projektu, dobijamo sledeci exception:

Spojler

TypeError: Error #2007: Parameter child must be non-null.
	at flash.display::DisplayObjectContainer/addChildAt()
	at fl.controls::BaseButton/fl.controls:BaseButton::drawBackground()
	at fl.controls::LabelButton/fl.controls:LabelButton::draw()
	at fl.controls::Button/fl.controls:Button::draw()
	at fl.core::UIComponent/drawNow()
	at com.yahoo.astra.fl.containers.layoutClasses::BaseLayoutPane/com.yahoo.astra.fl.containers.layoutClasses:BaseLayoutPane::redrawUIComponentChildren()
	at com.yahoo.astra.fl.containers.layoutClasses::BaseLayoutPane/com.yahoo.astra.fl.containers.layoutClasses:BaseLayoutPane::draw()
	at com.yahoo.astra.fl.containers.layoutClasses::AdvancedLayoutPane/com.yahoo.astra.fl.containers.layoutClasses:AdvancedLayoutPane::draw()
	at com.yahoo.astra.fl.containers::BoxPane/com.yahoo.astra.fl.containers:BoxPane::draw()
	at fl.core::UIComponent/drawNow()
	at com.yahoo.astra.fl.containers.layoutClasses::BaseLayoutPane/com.yahoo.astra.fl.containers.layoutClasses:BaseLayoutPane::redrawUIComponentChildren()
	at com.yahoo.astra.fl.containers.layoutClasses::BaseLayoutPane/com.yahoo.astra.fl.containers.layoutClasses:BaseLayoutPane::draw()
	at com.yahoo.astra.fl.containers.layoutClasses::AdvancedLayoutPane/com.yahoo.astra.fl.containers.layoutClasses:AdvancedLayoutPane::draw()
	at com.yahoo.astra.fl.containers::BoxPane/com.yahoo.astra.fl.containers:BoxPane::draw()
	at fl.core::UIComponent/fl.core:UIComponent::callLaterDispatcher()
Cannot display source code at this location.

Ovo se ne dešava ukoliko u novom projektu uz naš menuBar na isti ekran dodamo Button kontrolu (onu koja se nalazi u standardnom setu komponenti).
Da li je moguce resiti ovaj problem, tako da eventualni korisnici nase biblioteke ne moraju da
dodaju Button komponentu uz nas menuBar?