WPF Combobox Selected Item Binding Issue

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WPF

Hi All,

I am facing the issue with Binding the Slected Item with my WPF Combo. Follwing is the code -

XAML Code:

<

<ComboBox Grid.Row="3"   Grid.Column="1" Margin="0,13,272,13" ItemsSource="{Binding Path=PersonTiers, Mode=TwoWay}" SelectedValue="{Binding Path=SelectedPersonTier, Mode=TwoWay}" SelectedValuePath="Content"/>

View Model Code

public List<string> PersonTiers
   {
       get
       {
           List<string> lstPersonTiers = new List<string>();
           string[] TierArray = Globalization.TierString.Split(',');
           foreach (var item in TierArray)
           {
               lstPersonTiers.Add(item);

           }
           return lstPersonTiers;
       }

   }
   private string _selectedPersonTier;

   public string SelectedPersonTier
   {
       get { return //What should I write here ?.ToString(); }
       set
       {
           if (_selectedPersonTier != value)
           {
               _selectedPersonTier = value;
               this.OnPropertyChanged("SelectedPersonTier");
           }
       }
   }

I am able to get the Combo List , but not the Selected Item . Please help .