Fill FormatProperties.BackgroundFill color inside the border. Example 1Example = Canvas(1", 1", 2) { Background: Colors.Blue; TextColor: Colors.White; "Solid";};SolidExample 2Example2 = Canvas(1", 1", 2) { Background: new RadialGradient(0.25, 0.5, 0.5, 0.75, 1.2, 0.5, [ new(0, Colors.Red), new(0.2, Colors.Yellow), new(1, Colors.Green) ]); TextColor: Colors.White; "Radial Gradient";};Radial Gradient