_propDict)) { if (is_a($this->_propDict["fill"], "\Microsoft\Graph\Model\WorkbookChartFill") || is_null($this->_propDict["fill"])) { return $this->_propDict["fill"]; } else { $this->_propDict["fill"] = new WorkbookChartFill($this->_propDict["fill"]); return $this->_propDict["fill"]; } } return null; } /** * Sets the fill * Represents the fill format of a chart, which includes background formatting information. Read-only. * * @param WorkbookChartFill $val The fill * * @return WorkbookChartPointFormat */ public function setFill($val) { $this->_propDict["fill"] = $val; return $this; } }