The name of the field in the listname working list, the value of which will determine if a tree item should be selected when displayed.
Blank. Tree items cannot be pre-selected.
The name of the field in the working list that will contain a value of 'True' if an item in the tree should be selected. If set to 'Freeze', the item will be selected but the associated Tree View Target weblet (if applicable) will not be reloaded.