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When the OverviewMap control StaticMode is set to 'False' and the ExpandPercentage property is set to NaN, a “�resource not found” image is displayed in the OverviewMap control in an ArcGIS Server .NET Web mapping application.
The OverviewMap Control is set to use an ArcIMS service as its map resource, and the ExpandPercentage property of the OverviewMap control is set to NaN (not a number) and the StaticMode is set to 'False'.
This behavior is a caveat when using this control with an ArcIMS service.