ArcGIS Developer Help  (ESRI.ArcGIS.GlobeCore)  

BeforeDrawEventHandler Delegate

Represents the method that handles the BeforeDraw event.
[Visual Basic .NET]
Public Delegate Function BeforeDrawEventHandler ( _
    ByVal pViewer As ISceneViewer _
) As Boolean
[C#]
public delegate bool BeforeDrawEventHandler (
    ISceneViewer pViewer
);