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ShapeElement.MouseWheel Event

Occurs when the user rotates the mouse wheel.

Namespace:  Microsoft.VisualStudio.Modeling.Diagrams
Assembly:  Microsoft.VisualStudio.Modeling.Sdk.Diagrams.11.0 (in Microsoft.VisualStudio.Modeling.Sdk.Diagrams.11.0.dll)

public event DiagramMouseEventHandler MouseWheel

A convenient place to add a listener for this event is InitializeInstanceResources. To override this method in your custom code, you must set the Generates Double Derived property for the shape in DSL Definition and then click Transform All Templates in Solution Explorer.