How can I set the AutoCompleteBox.ItemTamplete in C# code

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C#

XAML

This method creates an AutoCompleteBox object

private AutoCompleteBox criaAutoCompletBox()
        {
            AutoCompleteBox acBox = new AutoCompleteBox();
            acBox.FilterMode = AutoCompleteFilterMode.ContainsOrdinal;
            acBox.IsTextCompletionEnabled = true;
            acBox.ValueMemberPath = "designacao";
            acBox.SetValue(Grid.MinWidthProperty, 100.0);
            acBox.SetValue(Grid.HeightProperty, 20.0);
            acBox.SetValue(Grid.MarginProperty, new Thickness(5, 0, 0, 0));

            return acBox;
        }

After created the AutoCompleteBox, this code snippet make the set of ItemSource,but does not show the desired attribute, only shows a list of the type of instantiated object

void rptacb_geraTabelaDadosCompleted(object sender, ReportWriterService.geraTabelaDadosCompletedEventArgs e)
        {
            try
            {
                for (int i = 0; i < relatorio.FC_RELATORIO_PARAMETROS.Count; i++)
                {
                    string tipo = relatorio.FC_RELATORIO_PARAMETROS.ElementAt(i).FCRP_TIPO;
                        AutoCompleteBox acb = ((System.Windows.Controls.AutoCompleteBox)(this.FindName(e.Result.campo)));
                        acb.ItemsSource = e.Result.tabela;
                }
            }
            catch (Exception ex)
            {
                new IMessage(ex).Show();
                Busy.appIsBusy(false);
            }
        }

I read on some forums, but found only one code in Xaml which is configured using the ItemTamplete, DataTemplate and TextBlock, but I do not how to do in C #.

<sdk:AutoCompleteBox Grid.Column="1"  Margin="2,0" Height="23" FilterMode="Contains" Padding="0"  ItemsSource="{Binding}" ValueMemberPath="designacao"  Width="Auto" Name="acbPesqProduto"  HorizontalAlignment="Stretch">
                       <sdk:AutoCompleteBox.ItemTemplate>
                           <DataTemplate>
                               <StackPanel FlowDirection="LeftToRight" Orientation="Horizontal">
                                   <TextBlock Text="{Binding Path=designacao}" Margin="0,0,0,10"/>
                               </StackPanel>
                           </DataTemplate>
                       </sdk:AutoCompleteBox.ItemTemplate>
                   </sdk:AutoCompleteBox>

I would like to have a similar code in C# or one that helps me to show the attribute "designacao" in my AutoComleteBox list,