add tooltip with command string to menu entries

## Expected Behavior
![image](https://user-images.githubusercontent.com/95811/92996343-302e2f80-f50b-11ea-8a75-941bef561e04.png)

## Actual Behavior
![image](https://user-images.githubusercontent.com/95811/92996326-15f45180-f50b-11ea-89e5-2a73d0d71866.png)
