Gets or sets the source mode for the drawing (FileInfo, Formula, Variable). Possible values are:
| Value | Meaning |
| 0 | File name |
| 1 | Formula |
| 2 | Variable |
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