User Interface extension custom tab for controller does not refresh when switching inbetween tabs

[ghost]

[Build] 16.1 fix5 20.01.2017

[Steps to reproduce]

1. tech. provider/ supplier: define custom tab for aws or any other controller to check status of VM
2. customer: create an aws subscription with VM
3. assign yourself to subscription (machine is already started by the above action)
4. go to custom tab; machine is running
5. to to Details tab; stop machine
6. press custom tab; check status
7. switch back and forth between two tabs several times

[Expected result] status of machine goes to stopping or stopped or whatever

[Observed result] status of machine never changes

[Details] This is misleading. You have to click on the subscription to actually reload this. Reload should be implemented when you click on custom tab.