under section Overriding the layout mechanism of the VBox
container in the provided code " var vm:EdgeMetrics =
viewMetricsAndPadding;" is mentioned. I could not find any
reference to the identifier "viewMetricsAndPadding"
Flex 3 - Box, HBox, and VBox layout containers:
Box, HBox, and VBox layout containers. The Box layout
container lays out its ... Specify an id value if you intend to
refer to a component elsewhere in your
3c. Designing a UI - Layout - Flex 3 Getting Started - Adobe:
In this section, you will learn how to use Flex's built-in
MXML components and containers as well as ActionScript 3.0 to
layout your application.