Steps to reproduce:

1. Add a load test in your project.

2. Double click on the load test to open/expand.

3. Once the test is opened in the middle pane double click on the test again.

Expected behavior: No change should be made since the test is already opened.

Actual behavior: The Tests tab disappears.

4. Close the Load test.

5. Tests Tab appear again.

6. Do a single click on the load test.

Expected behavior: no change should be made

Actual behavior: Two Tests tabs appear

Short video demonstration here: http://screencast.com/t/3PisxzUqBRT