function _pointMouseUp(e) {
        var self = e.target;

        self.focus();

        if (self.bezierEditor.dragElement) {
            self.bezierEditor.dragElement = null;
            self.bezierEditor._commitTimingFunction();
            self.bezierEditor._updateCanvas();
        }
    }
Handle mouse up in <button> element

@param {Event} e Mouse up event