Problem while binding DataGridComboBoxColumn in Datagrid

I am novice in WPF. I have a wpftoolkit datagrid where i am using a combo box as datagridcombox column. I am using a observable collection of Codes for binding the combo box. Below is the collection and its class...

#Region "Class & Coll"
Public Class CodesColl
    Inherits ObservableCollection(Of Codes)
End Class

Public Class Codes

    Private pCode As String
    Private pDescription As String 

    Public Sub New()
        pCode = String.Empty
        pDescription = String.Empty       
    End Sub
#End Region

#Region "Property"

    Public Property fldCode() As String
        Get
            Return pCode
        End Get
        Set(ByVal value As String)
            pCode = value
        End Set
    End Property

    Public Property fldDescription() As String
        Get
            Return pDescription
        End Get
        Set(ByVal value As String)
            pDescription = value
        End Set
    End Property


#End Region
End Class

Now what i want achieve is that i need to bind the collection with dropdown in the grid.In my grid i have two columns in first column i have to display the code (fldCode) , and on the selection of the code the next column of the same row will get populated with its description (fldDescription).

My Xaml is something like this:

<wpfkit:DataGrid Margin="3" Style="{DynamicResource SimpleDataGrid}" FontWeight="Normal"
 MaxHeight="100" ItemsSource="{Binding Source={StaticResource odpExistingCodesColl}}" 
 AutoGenerateColumns="False" Name="dgCodes" VerticalScrollBarVisibility="Visible" >                                 
<wpfkit:DataGrid.Columns>
    <wpfkit:DataGridTemplateColumn IsReadOnly="True">
        <wpfkit:DataGridTemplateColumn.CellTemplate>                                             
            <DataTemplate>                                                               
                <Image Style="{DynamicResource SimpleImageDelete}"/>
            </DataTemplate> 
        </wpfkit:DataGridTemplateColumn.CellTemplate>
    </wpfkit:DataGridTemplateColumn>
    <wpfkit:DataGridComboBoxColumn Header="Code" 
    DisplayMemberPath="fldCode" 
    SelectedValueBinding="{Binding fldCodes.fldCode}" 
    SelectedValuePath="fldCode"     
    SelectedItemBinding="{Binding fldCodeList}"                                        
    Width="100" x:Name="cbTCodes"  >
    <wpfkit:DataGridComboBoxColumn.ElementStyle>
        <Style TargetType="ComboBox">
            <Setter Property="IsSynchronizedWithCurrentItem" Value="False" />
            <Setter Property ="ItemsSource" Value="{Binding Path=odpCodesColl}"/>

        </Style>
        </wpfkit:DataGridComboBoxColumn.ElementStyle>
        <wpfkit:DataGridComboBoxColumn.EditingElementStyle >
            <Style TargetType="ComboBox">
                <Setter Property ="ItemsSource" Value="{Binding Path=odpCodesColl}"/>
                <Setter Property ="IsDropDownOpen" Value="True"/>
            </Style>
        </wpfkit:DataGridComboBoxColumn.EditingElementStyle>
    </wpfkit:DataGridComboBoxColumn>                                                        
    <wpfkit:DataGridTextColumn Width="375" Header="Description" x:Name="tbTCodeDescription" />
</wpfkit:DataGrid.Columns>
</wpfkit:DataGrid>

odpExistingCodesColl here is another collection through which i am binding th开发者_运维百科e entire grid and is used for sending the code and its description to but i am facing following problems

1. Unable to display the codes in dropdown.
2. Somehow i manged to do so but it disappears after loosing focus from the combobox.
3. Unable to retrive the description on its selection change as , i am unable to find the event too.

So you guys are requested to help me out asap.. any help will be highly appreciated.. Thanks in Advance Amit Ranjan

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You can check on Vincent's blog for detail information about how to work with Wpf DataGrid(DataGridComboBoxColumn too).