This example sets the GridLineColor property.
gcSpreadSheet1.Sheets[0].ShowGridLine = true;
gcSpreadSheet1.Sheets[0].GridLineColor = Windows.UI.Colors.Turquoise;
GcSpreadSheet1.Sheets(0).ShowGridLine = True
GcSpreadSheet1.Sheets(0).GridLineColor = Windows.UI.Colors.Turquoise
Target Platforms: Windows Server 2012, Windows RT