Wie fügt man Elemente unterschiedlicher Struktur in das ListView ein?

Question

Ich habe eine Listview, die dyanmically von Elementen gefüllt wird, die aus einem Gitter bestehen, das ein Bild und eine Schaltfläche wie folgt gilt:

<ListView x:Name="Thumbnails" HorizontalContentAlignment ="Left" VerticalContentAlignment="Top" Padding="0" Background ="#81AFD3" Grid.Row="6" Grid.Column="6" Grid.ColumnSpan="10" Grid.RowSpan="27" ScrollViewer.VerticalScrollBarVisibility="Visible" ItemsSource="{Binding ThumbModelList}" SelectedIndex="{Binding SelectedIndx}"> 
    <ListView.ItemTemplate> 
        <DataTemplate> 
         <ListViewItem> 

          <Grid Width="{Binding DataContext.ThumbnailWidth, RelativeSource={RelativeSource FindAncestor, AncestorType=ListView}}" Height="{Binding DataContext.ThumbnailHeight, RelativeSource={RelativeSource FindAncestor, AncestorType=ListView}}" HorizontalAlignment="Center" VerticalAlignment="Top" Background="Transparent" > 

           <Grid.RowDefinitions> 
            <RowDefinition Height="1*" /> 
            <RowDefinition Height="1*" /> 
            <RowDefinition Height="1*" /> 
            <RowDefinition Height="1*" /> 
            <RowDefinition Height="1*" /> 
            <RowDefinition Height="1*" /> 
            <RowDefinition Height="1*" /> 
           </Grid.RowDefinitions> 

           <Grid.ColumnDefinitions> 
            <ColumnDefinition Width="1*" /> 
            <ColumnDefinition Width="1*" /> 
            <ColumnDefinition Width="1*" /> 
            <ColumnDefinition Width="1*" /> 
            <ColumnDefinition Width="1*" /> 
            <ColumnDefinition Width="1*" /> 
            <ColumnDefinition Width="1*" /> 
            <ColumnDefinition Width="1*" /> 
            <ColumnDefinition Width="1*" /> 
            <ColumnDefinition Width="1*" /> 
            <ColumnDefinition Width="1*" /> 
            <ColumnDefinition Width="1*" /> 
            <ColumnDefinition Width="1*" /> 
            <ColumnDefinition Width="1*" /> 
           </Grid.ColumnDefinitions> 

           <Image Name="thumbImage" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="14" Grid.RowSpan="7" Stretch="UniformToFill" Source="{Binding MainThumbImagePath}"></Image> 

           <Button Name="slide_ON_OFF" Grid.Row="0" Grid.Column="10" Grid.ColumnSpan="4" Grid.RowSpan="4" VerticalAlignment="Center" Background="Transparent" Command="{Binding DataContext.SlideOnOffCommand, RelativeSource={RelativeSource FindAncestor, AncestorType=ListView}}"> 
            <Image Source="{Binding SomePath}"/> 
           </Button> 

          </Grid> 
         </ListViewItem> 
        </DataTemplate> 
       </ListView.ItemTemplate> 

      </ListView> 


     now, once the list is populated dynamically with those items, at certain positions, I want to insert a diffrerent item that has three different buttons like this: 

    <Grid Width="{Binding DataContext.ThumbnailWidth, RelativeSource={RelativeSource FindAncestor, AncestorType=ListView}}" Height="{Binding DataContext.ThumbnailHeight, RelativeSource={RelativeSource FindAncestor, AncestorType=ListView}}" HorizontalAlignment="Center" VerticalAlignment="Top" Background="Transparent" > 

         <Grid.RowDefinitions> 
          <RowDefinition Height="1*" /> 
          <RowDefinition Height="1*" /> 
          <RowDefinition Height="1*" /> 
          <RowDefinition Height="1*" /> 
          <RowDefinition Height="1*" /> 
          <RowDefinition Height="1*" /> 
          <RowDefinition Height="1*" /> 
         </Grid.RowDefinitions> 

         <Grid.ColumnDefinitions> 
          <ColumnDefinition Width="1*" /> 
          <ColumnDefinition Width="1*" /> 
          <ColumnDefinition Width="1*" /> 
          <ColumnDefinition Width="1*" /> 
          <ColumnDefinition Width="1*" /> 
          <ColumnDefinition Width="1*" /> 
          <ColumnDefinition Width="1*" /> 
          <ColumnDefinition Width="1*" /> 
          <ColumnDefinition Width="1*" /> 
          <ColumnDefinition Width="1*" /> 
          <ColumnDefinition Width="1*" /> 
          <ColumnDefinition Width="1*" /> 
          <ColumnDefinition Width="1*" /> 
          <ColumnDefinition Width="1*" /> 
         </Grid.ColumnDefinitions> 


         <Button Name="slide_ON_OFF" Grid.Row="0" Grid.Column="10" Grid.ColumnSpan="4" Grid.RowSpan="4" VerticalAlignment="Center" Background="Transparent" Command="{Binding DataContext.Command1, RelativeSource={RelativeSource FindAncestor, AncestorType=ListView}}"/> 
         <Button Name="slide_ON_OFF" Grid.Row="0" Grid.Column="10" Grid.ColumnSpan="4" Grid.RowSpan="4" VerticalAlignment="Center" Background="Transparent" Command="{Binding DataContext.Command2, RelativeSource={RelativeSource FindAncestor, AncestorType=ListView}}"/> 
         <Button Name="slide_ON_OFF" Grid.Row="0" Grid.Column="10" Grid.ColumnSpan="4" Grid.RowSpan="4" VerticalAlignment="Center" Background="Transparent" Command="{Binding DataContext.Command3, RelativeSource={RelativeSource FindAncestor, AncestorType=ListView}}"/> 
    </Grid> 

Ist dies möglich zu machen, und wo und wie dieses andere Listenelement zu erklären in XAML?