Topographic elements are not visible in your current view. You can modify View Range settings in the view's Properties or Visibility settings in Visibility/Graphics.

public static FailureDefinitionId SiteInvisible { get; }

Public Shared ReadOnly Property SiteInvisible As FailureDefinitionId
	Get

public:
static property FailureDefinitionId^ SiteInvisible {
	FailureDefinitionId^ get ();
}