I'm using TFS 2012 with the Scrum 2.0 template. Here's what I'm trying to do:

I want to have a list of all of the product backlog items that are ready for acceptance meetings with our PO. But have not yet been accepted.

I'm trying to do that by writing a work item query.

Here is my criteria:

List all PBI's (Product Backlog Items and Bugs)
where the PBI is part of the current sprint (iteration = a value I set)
and the PBI.State is not "Done" (we will set it to "done" after acceptance)

*and where all of the child tasks for the PBI are either "Removed" or "Done"*

That last criteria stumps me. I can see how I can make it where any of the child tasks are done, but I don't see a way to set up the filter so that all of the tasks must be done.