<TabItem DataContext="{Binding Children[1]}" Header="Database">
        <Grid Background="#FFE5E5E5" IsEnabled="True">
            <Grid.ColumnDefinitions>
                <ColumnDefinition/>
                <ColumnDefinition/>
                <ColumnDefinition/>
            </Grid.ColumnDefinitions>
            <ListView x:Name="ArtistListView" ItemsSource="{Binding ActiveArtists}" SelectedItem="{Binding SelectedArtist}"
                      ScrollViewer.HorizontalScrollBarVisibility="Disabled" Margin="10,10,5,10">
                <ListView.ContextMenu>
                    <ContextMenu FontSize="10">
                        <MenuItem Header="Delete Artist" Command="{Binding Path=DeleteArtistCommand, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type TabItem}}}" />
                    </ContextMenu>
                </ListView.ContextMenu>
                <ListView.View>
                    <GridView>
                        <GridViewColumn Header="Artist" DisplayMemberBinding="{Binding Name}" Width="150"/>
                    </GridView>
                </ListView.View>
            </ListView>
            <ListView x:Name="listView1" ItemsSource="{Binding ActiveAlbums}" SelectedItem="{Binding SelectedAlbum}"  Margin="5,10,5,10" Grid.Column="1">
                <ListView.View>
                    <GridView>
                        <GridViewColumn Header="Album" DisplayMemberBinding="{Binding Name}"
                                        Width="150"/>
                    </GridView>
                </ListView.View>
            </ListView>
            <ListView x:Name="listView2" ItemsSource="{Binding ActiveTracks}" SelectedItem="{Binding SelectedTrack}" Margin="5,10,10,10" Grid.Column="2">
                <ListView.View>
                    <GridView>
                        <GridViewColumn Header="Track" DisplayMemberBinding="{Binding Name}"
                                        Width="150"/>
                    </GridView>
                </ListView.View>
            </ListView>

public class MainWindowViewModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    private void RaisePropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    private MusicLogClient _musicLog;

    ObservableCollection<object> _children;
    public ObservableCollection<object> Children { get { return _children; } }

    public MainWindowViewModel()
    {
        string rootPath = "C:\Programs\MusicLog\UserData\";
        _musicLog = new MusicLogClient(new UserSettings(rootPath+"database.xml", rootPath+"credentials.xml"));
        _children = new ObservableCollection<object>();
        _children.Add(new ArtistEntryViewModel(_musicLog));
        _children.Add(new DatabaseViewModel(_musicLog));
    }