Sets the icon to be used when the item is expanded.
        
        :param      column | <int>
                    icon   | <QtGui.QIcon> || None

def setExpandedIcon( self, column, icon ):
        """
        Sets the icon to be used when the item is expanded.
        
        :param      column | <int>
                    icon   | <QtGui.QIcon> || None
        """
        self._expandedIcon[column] = QtGui.QIcon(icon)