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Using unbound column in Grid on Combo box edit settings. When i select the drop down and move into another row the previous row values are disappearing. 
while load the grid if any values exists then that value is appearing fine

What I have tried:

<pre>The coding are below, please help

<dxg:GridColumn FieldName="TestField" UnboundType="String" AllowEditing="True">
                                    ItemsSource="{Binding Path=dealPcode}"

 private void TagRegisterGrid_CustomUnboundColumnData(object sender, GridColumnDataEventArgs e)
            var grid = sender as GridControl;
            long temp=0,evalue=0;
               if (e.Column.FieldName == "TestField")
                    if (e.IsGetData)
                        long val;                        
                        long pKey1 = Convert.ToInt32(Convert.ToString(e.GetListSourceFieldValue("PK")).Replace ("{}",string.Empty));
                        if (dataService.GetPurchaseOrder(pKey1).GetValue().Count() >0)  // in the row PK value will be come (invisible)based on the key value will be                                                                                                                                                              //shown in dropdown 
                            val = Convert.ToInt64(dataService.GetPurchaseOrder(pKey1).GetValue());
                            e.Value = dealPcode.FirstOrDefault(x => x.PK == val).PK;
                            e.Value = evalue;
                    if (e.IsSetData)
                        evalue = Convert.ToInt64(e.Value);
                        temp = dealPcode.FirstOrDefault(x => x.PK == evalue).PK;                                                

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