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Access a control within a DataTemplate

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I have confused the forum. Delete this post. tnks.

How can I retrieve the control "Form_PdfViewer_Button_Image" that is inside the DataTemplate.
I don't want to iterate on controls but I want to be able to do FindName.
From behind it is only visible "Form_Buscar_LayoutPanel".

<dxdo:LayoutGroup x:Name="Form_Buscar_LayoutGroup" Orientation="Vertical" VerticalAlignment="Stretch">          <dxdo:LayoutPanel x:Name="Form_Buscar_LayoutPanel" Caption="Opciones de Búsqueda" Style="{StaticResource Dev_Layout}" ItemHeight="*" VerticalAlignment="Stretch">                    <dxdo:LayoutPanel.ControlBoxContentTemplate>                                    <DataTemplate x:Name="Form_Botones_Superior_DataTemplate">                                                                                <DockPanel x:Name="Form_Botones_Superior" Style="{StaticResource Botones_Superior}">                                            <Button x:Name="Form_PdfViewer_Button" Style="{StaticResource Button_Visor}" Width="29" Height="auto" Padding="0" Click="Fcn_AppVisores_Button_Click" Visibility="Visible">                                                <Image x:Name="Form_PdfViewer_Button_Image" Source="{StaticResource pdf}" Style="{StaticResource Button_Visor_Image}" Width="29" Height="auto"/>                                            </Button>                                        </DockPanel>                                    </DataTemplate>                                </dxdo:LayoutPanel.ControlBoxContentTemplate>                                <TabControl x:Name="Form_PageControl" DockPanel.Dock="Top" TabStripPlacement="Top">                                    <TabItem x:Name="Form_Buscar_TabItem" Header="Buscar" VerticalAlignment="Stretch">                                        <Grid x:Name="Form_Buscar_Grid" DockPanel.Dock="Top" Margin="2,0,2,0" VerticalAlignment="Top">                                            <Grid x:Name="Form_PdfViewer_Panel_Contenedor" Panel.ZIndex="2">                                                <dxpdf:PdfViewerControl x:Name="Form_PdfViewer" Visibility="Hidden"/>                                            </Grid> ...


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