https://learn.microsoft.com/en-us/dotnet/api/system.windows.controls.grid.showgridlines?view=netframework-4.8.1&viewFallbackFrom=windowsdesktop-10.0
Grid.ShowGridLines Property (System.Windows.Controls) | Microsoft Learn
Gets or sets a value that indicates whether grid lines are visible within this Grid.
property systemgridwindowscontrolsmicrosoft