Here is something that worked for me although I cannot explain why it worked:
- Right click the AdvancedHMI project in Solution Explorer and select Properties
- Select the Debug tab
- Choose the option Start External Program
- Browse to devenv.exe which will be in a directory similar to this: C:\Program Files (x86)\Microsoft Visual Studio 12.0\Common7\IDE\devenv.exe
- Start your application like normal
- A new version of VS should open up, when it does open the same AdvancedHMI solution
- Open MainForm and check the TooLbox
- Close that second instance of VS
- Back on the Properties->Debug change back to Start Project option
As I was trying to locate this issue, I did that sequence and ever since, the 2 drivers started showing up in my ToolBox