Gets or sets the style of the filling. Possible values are
| Value | Meaning |
| 0 | transparent |
| 1 | solid / fixed color |
| 2 | horizontal gradient |
| 3 | vertical gradient |
| 4 | horizontal two part gradient |
| 5 | vertical two part gradient |
Platforms: Windows 10 (Version 21H2 - 22H2), Windows 11 (22H2 - 25H2), Windows Server 2016 - 2025
.NET: .NET Framework 4.8, .NET 8, .NET 9, .NET 10