Gets or sets the legend label used by the map layer group.
This property adheres to the setAutoRefresh method except when called from the onViewChanging or onViewChanged events.
Note that for write operations, this property does not work during a busy state. For additional information, refer to "Handling Busy State and Map Refresh" chapter in the Autodesk MapGuide Developer's Guide.
-1 (busy): For write operations only.