ComboxBox in DataGrid not showing List in WPF

Question

I have a Datagrid and inside first column I have a ComboxBox which holds list of Fee Types.User will need to select the type of fee and enter amount in the next column which is a textbox.I have binded this with the ObservableCollection but the list is not showing up.This is my xaml,see I have binded a observablecollection 'lstFeeType' which is a list of FeeType e.g Admission,Practicle etc.

<DataGrid Name="FTDataGrid" AutoGenerateColumns="False" CanUserAddRows="False" Grid.Row="5" Grid.ColumnSpan="2" ScrollViewer.VerticalScrollBarVisibility="Visible" Height="120" >

            <DataGrid.Columns>
                <DataGridTemplateColumn Header="Fee Type"  Width="*" >
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <ComboBox ItemsSource="{Binding Path=FeeTypeCollection}" Grid.Row="2" Grid.Column="1"  Name="cmbFeeType" Width="165" Height="25" SelectedValuePath="Id" DisplayMemberPath="Description" SelectedItem="{Binding FeeType}" SelectedValue="{Binding FeeType}"/>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>

                <DataGridTemplateColumn Header="Amount"  Width="*" >
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBox Name="tbFeeAmount" Height="25" Width="140" Text="{Binding Path=Amount}" />
                          </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTemplateColumn Header="+" Width="Auto" >
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <Button HorizontalAlignment="Center" VerticalAlignment="Center" Background="#2BB3EE" Foreground="#FFFDFAFA" Width="20" Height="20" Style="{StaticResource GelButton}" Click="AddRow_Click" >+</Button>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTemplateColumn Header="-" Width="Auto" >
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <Button   HorizontalAlignment="Center" VerticalAlignment="Center" Background="#2BB3EE" Foreground="#FFFDFAFA" Width="20" Height="20" Style="{StaticResource GelButton}">-</Button>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>


            </DataGrid.Columns>
        </DataGrid>

Code:

ObservableCollection<FeeCollection> _lstFee;
    public AddEditFee()
    {
        _lstFee = new ObservableCollection<FeeCollection>() { new FeeCollection() { FeeTypeCollection = FeeTypeCollection() } };
        InitializeComponent();
        FTDataGrid.ItemsSource = _lstFee;
    }
    private ObservableCollection<Dictionary> FeeTypeCollection()
    {

        ObservableCollection<Dictionary> lstFeeType = new ObservableCollection<Dictionary>() { new Dictionary() { Id = 1, Description = "Admission" },new Dictionary() { Id = 1, Description = "Tution" },new Dictionary() { Id = 1, Description = "Annual" }, new Dictionary() { Id = 1, Description = "Practicle" }};
        return lstFeeType;
    }
    private void Cancel_Click(object sender, RoutedEventArgs e)
    {
        this.Close();
    }

    private void AddRow_Click(object sender, RoutedEventArgs e)
    {
        _lstFee.Add(new FeeCollection() { FeeTypeCollection = FeeTypeCollection() });

    }

    private void Save_Click(object sender, RoutedEventArgs e)
    {
        int a =FTDataGrid.Items.Count-1;
        FeeCollection docPresObj = new FeeCollection();
        docPresObj = (FeeCollection)(FTDataGrid.Items[a]);
    }

Classes:

public class Dictionary
{
    public int Id { get; set; }
    public string Description { get; set; }
}
public class FeeCollection
{
   public Dictionary FeeType { get; set; }
   public double Amount { get; set; }
   public ObservableCollection<Dictionary> FeeTypeCollection { get; set; }
}

What am I doing wrong,Please guide me.

Answer 1

My guess would be that since FTDataGrids ItemSource is set to _lstFee it can't find lstFeeType in FeeCollection (should normally be shown as a binding error). I would try placing "lstFeeType" as a property into the FeeCollection class .