Note: The Container\ContainerInitialize.cs file no longer exists in project - the following is for educational purposes only.
Copy the ContainerInitialize path to the clipboard
Add it as an existing item to the Tests project's Container folder
Paste the ContainerInitialize path into the textblock
!! IMPORTANT !! Click the down arrow to the right of the Add button (do not click Add) and select Add As Link
Your newly added file will have a little arrow shortcut icon indicating that there is not actually a file in the project - the project has a pointer to the location of the ContainerInitialize class in the Libraries.Demo file (they both share the same file)