Set ComboBox Selected Value in Silverlight Window

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Silverlight

combobox

Hi,

I have a Silverlight Window which has a ComboBox with a set of other fields.
I set the DataContext of the Window from the Silverlight Page.
all the Fields are mapped correctly, except for the ComboBox Column.
It always displays the First item in the ComboBox and not the SelectedItem.
I tried to set the ComboBox selectedvalue selected item and nothing seem to work.

Following is the code that i have written.

<ComboBox Name="cmbCodeParts"
     Width="120"
     HorizontalAlignment="Left"
     ItemsSource="{Binding ElementName=tblRecipe_CodePartsTypeDomainDataSource, Path=Data}"
     DisplayMemberPath="codePartsType"
     SelectedValuePath="codePartsTypeID"
     SelectedValue="{Binding codePartsTypeID,Mode=TwoWay}"/>

I have loaded the DomainDataSource for the combobox in the dataform content loaded event.

Does anybody have a good working sample of this? I would appreciate help correcting my code for any errors.