Not working for SQL Server Integration Services project.

[afraaij]

Describe the bug
Nothing shows in the SSIS Project solution.
Have the Solution open and in the .dtproj file a dtsx package file is missing that is available in de the project file

To Reproduce
Steps to reproduce the behavior:

1. Go to a SSIS Solution
2. Manual add a DTSX file to the solution folder
3. Right click the solution and choose build
4. No error only missing files are not shown..

Expected behaviour
Some message in the output folder that a dtsx package is missing from the solution?