Closed Unassigned: BusyIndicator some controls remain disabled after IsBusy = false [20778]

Based on:
https://wpftoolkit.codeplex.com/discussions/303717

TabItem controls in TabControl that are not selected get disabled after setting IsBusy = true. Then after setting IsBusy to false only some TabItem controls get re-enabled, the rest remains disabled.
Comments: No more info from user