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<Window x:Class="FS_Test2.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="301" Width="292" Loaded="Window_Loaded" Initialized="Window_Initialized" WindowState="Maximized"
        Drop="photoPanel_Drop" AllowDrop="True">
    <DockPanel AllowDrop="True">
        <StackPanel Name="main" DockPanel.Dock="Top" Drop="photoPanel_Drop" 
                    AllowDrop="True" 
                    ClipToBounds="True" Visibility="Visible" DragEnter="main_DragEnter">
            <Menu>
                <MenuItem Header="{DynamicResource File}"/>
                <MenuItem Header="{DynamicResource Help}"/>
            </Menu>

        </StackPanel>
    </DockPanel>
</Window>                    

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        private void ZoomSlider_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
        {

            double value = e.NewValue;

            Image test = main.FindName("image") as Image;
            //hier erhalte ich immer eine null
            ...
            
        }

        private void photoPanel_Drop(object sender, DragEventArgs e)
        {
                    ...
                    
                    Image img = new Image();

                    img.Source = bitmap;
                    img.Name = "image";
                    img.Width = bitmap.Width;

                    img.Height = bitmap.Height;

                    Point p = e.GetPosition(photopanel);

                    img.Margin = new Thickness(0, 0, 0, 0);
                    img.VerticalAlignment = VerticalAlignment.Center;
                    img.AllowDrop = true;


                    main.Children.Add(img);
 
        }                    

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                    NameScope.SetNameScope(this, new NameScope());
                    RegisterName(img.Name, img);