Flex Popup not setting child CSS from global style sheet - css

I have a CustomListItemRenderer class. It's styling, and contained components' styling, are set via an external CSS stylesheet.
When this renderer is used in a list in the main application, everything is set and styled correctly. When this renderer is being used in a list inside of a popup opened through the PopupManager class, the styling is not being set correctly.
This is a Flex Web Application: SDK 4.1
Help is greatly appreciated.

You need to define it in your CSS also as something like PopupManager CustomListItemRenderer{} since popups use different style ancestors. So defining it specifically for use in popups again will fix your issue.

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