When true, the chart will display grid lines.
///Minor Gridlines apply only to 2D Charts. 3D Charts will show Major GridLines, but not Minor GridLines.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2