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Adding a not selected value to data set in combo box

Hi there


I have search the web flat and it seems like my googling skills let me down.  I was not able to add a "not selected" item to a bounded comboBox.  Is there a way to do it with the XamComboEditor?


This is what I wanted to do...  But with no success.


<igEditors:XamComboEditor ItemsSource="{Binding Source={StaticResource odpStockNo}}"
                                                  Value="{Binding Path=FKStockNo}"
                                                  DisplayMemberPath="StockNo" Name="igCombo">
                                    <igEditors:ComboBoxDataItem DisplayText=" not selected " Value="-1"/>


but it seems like it is not possible to add an item to a already bounded object.  Is there a work around?  It cant be that difficult?!  It is standard in asp and WinForms!