'Inform the item that its selection state has changed.
**Arguments:**
sel            (bool) whether the item is currently selected
multi          (bool) whether there are multiple items currently
selected'

def selectionChanged(self, sel, multi):

    self.selectedAlone = (sel and (not multi))
    self.showSelectBox()
    if self.selectedAlone:
        self.ctrlWidget().show()
    else:
        self.ctrlWidget().hide()
