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I am working on a WPF application and following MVVM. In my view there is a grid view which contains different columns. One of these column is a ListBox. Now problem is that for the ListBox column, SelectedItem get works fine but set doesn't. Here is my View code <DataGrid ItemsSource="{Binding Items}" SelectedItem="{Binding SelectedItem}" SelectionMode="Single"> <DataGrid.Columns> <DataGridTextColumn Binding="{Binding Name}" Header="Name" /> <DataGridTemplateColumn Header="Actions"> <DataGridTemplateColumn.CellTemplate> <DataTemplate> <ListBox DisplayMemberPath="Name" ItemsSource="{Binding Actions}" SelectedItem="{Binding SelectedAction}" /> </DataTemplate> </DataGridTemplateColumn.CellTemplate> </DataGridTemplateColumn> </DataGrid.Columns> </DataGrid> In my ViewModel, I have Main ViewModel class, which contains a list of Items. Item class contains name, a list of actions and selected action. public class MyViewModel : INotifyOfPropertyChanged { private ObservableCollection<Item> _items; public ObservableCollection<Item> Items { get { return _items?? (_items= new ObservableCollection<Item>); } } private Item _selectedItem; public Item SelectedItem { get { return _selectedItem; } set { _selectedItem= value; } } } public class Item : INotifyOfPropertyChanged { public string Name; private ObservableCollection<string> _actions; public ObservableCollection<string> Actions { get { return _actions?? (_actions= new ObservableCollection<string>); } } private string _selectedAction; public string SelectedAction { get { return _selectedAction; } set { _selectedAction = value; } } } </co

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