gtk:drop-down-expression (object)

object -- a gtk:drop-down widget
expression -- a gtk:expression object, or nil

Accessor of the expression slot of the gtk:drop-down class. The gtk:drop-down-expression function gets the expression. The (setf drop-down-expression) function sets the expression that gets evaluated to obtain strings from items when searching in the popup. The expression must have a value type of "gchararray".