Our latest version of FDT comes with basic Mylyn support.
You can find more details about Mylyn here.

The Mylyn task context of the active task influences how the FDT Explorer and Outline show their content. Some elements inside the FDT Explorer are grayed since they are not part of the current task context as you can see here:mylynoverviewgrayedThe same is true for the Outline. Inside the task context the touched (edited or visited) elements are listed. For Flash projects these elements can be projects, folders, files, functions, classes, interfaces, and libraries.

By focusing on the active task most grayed elements would be filtered:
All parents of unfiltered elements are also presented but grayed depending on the current task context.