function close() {
        container.removeChild(root);
        self._dom = null;
    }
If set to null/undefined/false, select disabled.
@param {Object} brushOption
@param {string|boolean} brushOption.brushType 'line', 'rect', 'polygon' or false
                         If passing false/null/undefined, disable brush.
                         If passing 'auto', determined by panel.defaultBrushType.
                             ('auto' can not be used in global panel)
@param {number} [brushOption.brushMode='single'] 'single' or 'multiple'
@param {boolean} [brushOption.transformable=true]
@param {boolean} [brushOption.removeOnClick=false]
@param {Object} [brushOption.brushStyle]
@param {number} [brushOption.brushStyle.width]
@param {number} [brushOption.brushStyle.lineWidth]
@param {string} [brushOption.brushStyle.stroke]
@param {string} [brushOption.brushStyle.fill]
@param {number} [brushOption.z]