Undo or redo an action
Expression Studio 3.0
You can undo anything that you do in Microsoft Expression Blend if it results in a change to a file. For example, you can undo changes that you make on the artboard, and also changes in panels such as the Resources panel, because all those changes result in a modification to a .xaml or code-behind file in the solution. Some actions that you take might result in more than one change and thus are separated in the undo list.
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