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When user clicks the cell "Add new expression", it goes into edit mode and displays a textbox. At this time, we can open a hover infopop dialog (similar to what opens on in JDT when you hover the mouse over a method name). The UI focus will remain in the edit textbox, but the hover infopop will explain how to define enhanced expressions. This hover infopop will also have a checkbox "Do not show me again" so that user can prevent it from opening everytime he wants to type in an expression.