WPF - ObservableCollection<string> nao dispara PropertyChanged

Ola pessoal,

	Eu tenho uma array de string, e estou usando o ObservableCollection<string>, entao na view quando o usuario entra com algum valor nos textbox gerado automaticamente nao dispara o PropertyChanged, ja tentei varias coisas, ja tentei usar o CollectionChanged mas como eh string dah pau. Alguem ja passou por isso

	 

	Segue o XAML:

 <Grid Grid.Column="0" >
 <ItemsControl ItemsSource="{Binding Processes[0].ActualDivisible, UpdateSourceTrigger=PropertyChanged}" ap:FocusProperty.GotFocus="{Binding Processes[0].GotFocusCommand}"
 ap:FocusProperty.LostFocus="{Binding Processes[0].LostFocusCommand}">
 <ItemsControl.ItemTemplate>
 <DataTemplate>
 <TextBox TabIndex="1" Text="{Binding Path=., UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}" ap:FocusProperty.GotFocus="{Binding Processes[0].GotFocusCommand}" ap:FocusProperty.LostFocus="{Binding Processes[0].LostFocusCommand}" />
 </DataTemplate>
 </ItemsControl.ItemTemplate>
 <ItemsControl.ItemsPanel>
 <ItemsPanelTemplate>
 <UniformGrid Rows="1"/>
 </ItemsPanelTemplate>
 </ItemsControl.ItemsPanel>
 </ItemsControl>
 </Grid>

	 

	E na minha classe declarei assim minha propriedade

	 

 private ObservableCollection<string> _actualDivisible;
 public ObservableCollection<string> ActualDivisible
 {
 get
 {
 if(_actualDivisible == null)
 {
 _actualDivisible = new ObservableCollection<string>() { "" };
 }
 return _actualDivisible;
 }
 set
 {
 if (_actualDivisible != value)
 {
 _actualDivisible = value;
 RaisePropertyChanged();
 }
 }
 }

	Alguem ja teve esse problema?