How to add Entities under ERModel to current diagram

[peter.wong]

Hi Ryan,

There are 2 problems on this case.

1. The project is not saved after you create your diagram.
   Please call ProjectManager.saveProject() to save your project.

2. The process is not stopped after running your plugin. We will fix it. But before our fix, you may stop the process manually, after your project is saved.

as screenshot: