Steps to Reproduce:
1. Select Hosts tab
2. Select a host
3. Select Events subtab

No entries show up

Additional info:
The reason is, that in parallel two timers are running:
- the timer which refreshes the list of hosts
- the timer which refreshes the events on the subtab

The problem is, that before the timer refreshing the subtab fires the event, the timer which refreshes the hosts fires an event and refreshes the list of hosts. The HostEventListModel in a reaction to this change performs the search again which first stops it's timer and than starts it again. But again, before it raises an event the timer which refreshes the hosts raises an event etc...