The name of the WAM whose Webroutine will be invoked when an item in the tree is selected. Individual items in an unlevelled list can override this using the list_onselect_wamname_field property.
Default value
The current WAM.
Valid values
The name of a WAM, in single quotes. A selection can be made from a list of known WAMs by clicking on the corresponding dropdown button in the property sheet.