Silverlight treeview observablecollection not updating

I don’t know the exact mechanism that enables this behavior, but we’re going to take advantage of it to make our binding work…

Click on the Behavior in the Objects and Timeline window, and in the Properties window, clear out the Search box. Set the Event Name to Selected Item Changed (so that the Behavior will fire when the selected item is changed in the Tree View).I poked around for a bit until I found the easiest method to do this that I could find.Create a new Expression Blend 4 (or higher) project.(if you don’t see this, install the Silverlight 4 SDK).Drag and drop it on the Tree View control (either in the Objects and Timeline window or on the design canvas).

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