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This event is fired when Build is called on a Terrain.
[Visual Basic .NET] Public Event OnBuild As OnBuildEventHandler
[C#] public event OnBuildEventHandler OnBuild
[C++]
HRESULT OnBuild(
  IEnvelope* pExtent
);
[C++] Parameters pExtent [in]
pExtent is a parameter of type IEnvelope*