The name of the field that will be sent to the "On Expand" or "On Submit" Webroutine containing the level of the expanded or selected item. If not specified, the level will not be returned to the Webroutine.
Default value
Blank. Do not send a level.
Valid values
The name of a valid input field. A selection can be made from a list of valid fields by clicking on the corresponding dropdown button in the property sheet.