LoadingMessage is a string that displays next to the node being expanded. The node needs to have expand mode equal to ServerSideCallBack or WebService.
The position of the loading message relative to the node text is determined by the LoadingStatusPosition property. Its possible values are as follows:
None to suppress the loading message.
- When the PersistLoadOnDemandNodesproperty is True (the default), nodes populated through load-on-demand are persisted on the server automatically.