Sets the icon overlay for this item at the inputed column to the
        given icon.
        
        :param      column | <int>
                    icon   | <str> || <QtGui.QIcon>

def setIconOverlay(self, column, icon):
        """
        Sets the icon overlay for this item at the inputed column to the
        given icon.
        
        :param      column | <int>
                    icon   | <str> || <QtGui.QIcon>
        """
        self._iconOverlays[column] = QtGui.QIcon(icon)