Steps to reproduce using + tab.

1. Create a project with Robot and Teleop.
2. Click on the + tab.
3. In the Add Tab dialog, click Mechanisms.
4. Under Create New Mechanism, enter GamePieceShooter.
5. Click Create.
   Notice that the GamePieceShooter tab is active, but the blockly workspace and the python code still show the robot.
6. Click on the Teleop tab
   Notice errors in the console.

Steps to reproduce using Manage - Mechanisms...

1. Create a project with Robot and Teleop.
2. In the menu, expand Manage...
3. In the Mechanism Management dialog, under Create New Mechanism, enter GamePieceShooter.
4. Click Create.
   Notice that the whole window turns white and there are errors in the console.