OK... so this solution doesn't help
XAML is here
<ListBox ItemsSource="{Binding Path=ContentItems}" Background="White" >
<ListBox.ItemTemplate>
<DataTemplate>
<Grid Margin="2" Height="Auto" Width="Auto">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Grid Grid.Column="0">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="Auto"/>
</Grid.RowDefinitions>
<StackPanel Grid.Row="0" Orientation="Horizontal">
<Label VerticalAlignment="Center" Margin="0,0,0,5">Start</Label><svl:TimeEditor Value="{Binding Path=FormatedStart}" Width="87" HorizontalAlignment="Left" Margin="2,8" Name="dtpStart" FontSize="12" Height="25" VerticalAlignment="Center" />
<Label VerticalAlignment="Center" Margin="0,0,0,5">End</Label><svl:TimeEditor Value="{Binding Path=FormatedEnd}" Width="87" HorizontalAlignment="Left" Margin="2,8" Name="dtpEnd" FontSize="12" Height="25" VerticalAlignment="Center" />
</StackPanel>
<TextBlock Grid.Row="1" TextWrapping="Wrap" Name="tbText" Text="{Binding Path=Data}"></TextBlock>
</Grid>
<Grid Grid.Column="1" Visibility="Collapsed">
</Grid>
</Grid>
</DataTemplate>
</ListBox.ItemTemplate>
</ListBox>