It's a problem with the way you use the parentheses. Your code is:
(vidButtonBox.getChildAt(0) as VBox).(getChildAt(0) as
VBox).setStyle("backgroundAlpha","0");
Setting the "(" after the accessor "." is being interpreted as function call
(perhaps setting a filter? anyone knows?). You have to put the whole
expression between the parentheses like this:
((vidButtonBox.getChildAt(0) as VBox).getChildAt(0) as
VBox).setStyle("backgroundAlpha", "0");
--
Haykel Ben Jemia
Allmas
Web & RIA Development
http://www.allmas-tn.com