Where is the expression window in Xcode 4?

Question

How can I add an expression to watch in Xcode 4?

This should be very obvious, but it is not. It does not seem to be down any menu or available on a contextual click

Answer 1

For those looking for a Swift usage of Add Expression: Right click the Variables View in Debug Area. Then choose the Add Expression

Write your instanceName or instanceName.propertyName and press enter. It is that easy.