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Add-in extension - Spatial reference changed event

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Hi,

is there any way how to wire SpatialReferenceChanged event from my add-in extension class?

I tried to do something like:
Code:

protected override void OnStartup()
{
IActiveViewEvents_Event activeViewEvent = (IActiveViewEvents_Event)ArcMap.Document.ActiveView.FocusMap;
activeViewEvent.SpatialReferenceChanged += new IActiveViewEvents_SpatialReferenceChangedEventHandler(OnSpatialReferenceChanged);
}

void OnSpatialReferenceChanged()
{
System.Windows.Forms.MessageBox.Show("SpatialReferenceChanged");
}

But it doesn't work.

Thank you.

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