How and where will I set methods on that Controls:AutoCompleteBox that comes from the application.xaml?

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VB

user-controls

ListView

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All I wanted is to put autocomplete data in a textbox inside a user control listbox. This autocomplete textbox is source from a template. How do I set methods on that Controls:AutoCompleteBox that comes from the application resources and where?

Here is the code from the application.xaml file, notice that Controls:AutoCompleteBox

<Application.Resources>
        <Style x:Key="TextBoxDescCell" TargetType="Controls:AutoCompleteBox">
            <Setter Property="Margin" Value="5,5,5,5" />
            <Setter Property="HorizontalAlignment" Value="Left"/>
            <Setter Property="VerticalAlignment" Value="Top"/>
            <Setter Property="Width" Value="400"/>
            <Setter Property="Height" Value="25"/>
        </Style>

        <DataTemplate x:Key="DescriptionCellTemplate">
            <Controls:AutoCompleteBox x:Name="descriptionBox" Text="{Binding Path=Description}" Style="{StaticResource TextBoxDescCell}" />
        </DataTemplate>

    </Application.Resources>

this is from IFormControl.xaml

<ListView ItemsSource="{Binding}"  x:Name="listView" HorizontalAlignment="Left" Height="386" Margin="543,66,0,0" VerticalAlignment="Top" Width="663">
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="Description" CellTemplate="{StaticResource DescriptionCellTemplate}"></GridViewColumn>
                    <GridViewColumn Header="Amount" DisplayMemberBinding="{Binding Amount}" Width="100" ></GridViewColumn>
                </GridView>
            </ListView.View>
        </ListView>

I uses tabControl, every tab generates the userControl that uses templates

Dim item As New TabItem
Dim iForm = New IFormControl
item.Content = iForm 
tabControl.Items.Add(item)

I have 2 years of experience with visual basic 7 during my college days, and now It has been 7 years I haven't touch it. I just started this one last 3 days ago. Any ideas please? Thanks a lot.