- refresh the GUI immediately after action operation (i.e. don't wait for the next auto-refresh iteration)
- changes in all of the GUI sections should be reflected at the same time: currently, we may see an update in the Events main tab (e.g. VM x has been removed) but only a couple of seconds afterwards, we may see this change in the relevant main-tab (e.g. VMs), for example. Need to change that so all GUI parts will reflect changes at the same time