In desktop edition 2.0 I could call the method Map.GetExtentFromShapes in order to calculate an extent for a map based on the extent of all the dynamic shapes.
What is the equivalent method for desktop edition 3.0? Let's say I want to use an InMemoryFeatureLayer and add some features to it (similar to the CSWpfHowDoISamples.EfficientlyMoveAPlaneImage.xaml.cs sample). Can I just open the layer, grab the bounding box, and use the bounding box to calculate an extent?