Solution
Possibly when adding .NET assembly from external sources, it is not fully tested in LabVIEW. Probably the size of the .net container of the .NET assembly is not defined so when added to LabVIEW which makes the container becomes missing.
How to set size .NET container
- Programatically:
- Use Property Node to edit the height of the controls
- Manually
- Insert .NET controls
- Resize the .NET control. Resizing the .NET control will remove the autosizing of the controls.