Description of problem:
When selecting a Host in the Hosts main grid and choosing the 'Hardware' sub-sub-tab in the 'General' sub-tab, the selected main-tab is unexpectedly changed to be the VMs main tab. 

Version-Release number of selected component (if applicable):
latest 'master' (3.6)

How reproducible:
100%

Steps to Reproduce:
1. Go to the Hosts main tab, make sure that you have multiple Hosts there. 
2. Select a Host
3. Select the 'General' sub-tab (if not selected already)
4. Select the 'Hardware' sub-sub-tab within the 'General' sub-tab
5. Select a different Host in the Hosts grid. 

Actual results:
The GUI navigates away from the Hosts main tab into the VMs main tab

Expected results:
The GUI should remain in the Hosts main tab; The sub-tab-panel should update to reflect the details of the newly-selected Hosts, and should remain focused on the 'General' sub-tab -> 'Hardware' sub-sub-tab. 

Additional info:
The other sub-sub-tabs ('Info', 'Software') are behaving correctly.