This method or property must be called within the lambda passed to QueuedTask.Run.
Remarks
If the mode is set to ArcGIS.Core.CIM.SublayerVisibilityMode.Exclusive then only one sublayer can be visible at a time. If multiple sublayers are visible, then all sublayers are set to be not visible except for the first visible sublayer. If no sublayers are visible, then the first sublayer is set to be visible.