




 
Gets and sets the expanded state of an item in a tree-view.
The generic function 
tree-view-expanded-p
 is the predicate for whether 
item
 is expanded in 
tree-view
. If item is not in 
tree-view
, the function returns 
nil
.
(setf tree-view-expanded-p)
 sets the expanded state of 
item
 in 
tree-view
 to 
on
. If 
item
 is not in 
tree-view
, the function does nothing.
CAPI Reference Manual - 15 Dec 2011