Finding the DesiredSize of a FrameworkElement before display

mayalan
mayalan used Ask the Experts™
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I am creating a fixed document from a flow document using a custom paginator like the one given here. I want to add a header/footer to the page but neither are a fixed size and need to be calculated (so the page size can be adjusted accordingly to fit them).

The header/footer are represented as a FrameworkElement class. I need to work out the desired size of the FrameworkElement before placing it on the page so the page margin size of the paginator can be adjusted to accomodate everything.  Is there an easy way to do this?

thanks  
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