Nayara FJ
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Nayara FJ
I solved In method "FocusedValueChanged" I changed this line `mdiChild.Dispatcher.BeginInvoke(new Func(Keyboard.Focus), System.Windows.Threading.DispatcherPriority.ApplicationIdle, mdiChild.Content);` for this `mdiChild.Dispatcher.BeginInvoke(new Func(Keyboard.Focus), System.Windows.Threading.DispatcherPriority.ApplicationIdle, mdiChild); `