I'm able to use a CustomizationFilter to run my custom addin code when the user right clicks on a Layer in the Contents Pane and clicks on "Zoom to Layer".
I try to do the same only this time I select an object on the map which opens the Pop-up Pane and then right click the object and try to "Zoom To" that object. Is the "Zoom To" not a command like the other? Is there a way to execute custom addin code instead of the default "Zoom To" behavior?