WPF MVVM Button Control Bindung in DataTemplate

Ich habe andere Fragen gesehen, die sich damit befassen, aber niemals expliziten Code, der das Update beschreibt. Ich kann in meinem ItemTemplate keine Schaltfläche zum Binden an einen beliebigen Befehl finden. Sehr frustrierend. Ich bin übrigens ein kompletter MVVM-Neuling.

Hier ist meine Window XAML.

<Window x:Class="RET.CMS.Printing.App.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="clr-namespace:RET.CMS.Printing.App.ViewModel"
    Height="350" Width="525"
    WindowStartupLocation="CenterScreen"
    Title="{Binding Path=DisplayName}"
    >
<Window.Resources>
    <ResourceDictionary Source="MainWindowResources.xaml" />
</Window.Resources>
<Window.DataContext>
    <local:MainWindowViewModel />
</Window.DataContext>

<DockPanel Margin="10">
    <Grid Margin="10" DockPanel.Dock="Top">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="1*" />
            <ColumnDefinition Width="1*" />
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition />
        </Grid.RowDefinitions>
        <Image Grid.Column="0" MaxHeight="75" MinHeight="25" HorizontalAlignment="Left"
                   Source="/RET.CMS.Printing.App;component/Resources/BarkleyREI%20%283%29.png" />
        <TextBlock Grid.Column="1" HorizontalAlignment="Right" 
                    Height="30" VerticalAlignment="Top"
                    Style="{StaticResource TBHyperlinkStyle}"
                    >
            Help
        </TextBlock>
    </Grid>

    <Border Padding="10" DockPanel.Dock="Left">
        <DockPanel>
            <Label Style="{StaticResource H1Style}" DockPanel.Dock="Top">YOUR PRINTERS</Label>
            <StackPanel Margin="10" DockPanel.Dock="Top">
                <Button Style="{StaticResource RegularButton}" HorizontalAlignment="Left" Command="{Binding RefreshPrintersCommand}">Refresh List</Button>
            </StackPanel>
                <ListBox ItemsSource="{Binding Printers}" DockPanel.Dock="Left">
                <ListBox.ItemContainerStyle>
                    <Style TargetType="ListBoxItem">
                        <Setter Property="HorizontalContentAlignment" Value="Stretch" />
                    </Style>
                </ListBox.ItemContainerStyle>
                    <ListBox.ItemTemplate>
                <DataTemplate>
                        <Border Padding="5">
                            <StackPanel>
                            <Grid>
                                <Grid.ColumnDefinitions>
                                    <ColumnDefinition Width="*" />
                                    <ColumnDefinition Width="75" />
                                </Grid.ColumnDefinitions>
                                <Grid>
                                    <Grid.RowDefinitions>
                                        <RowDefinition Height="*" />
                                        <RowDefinition Height="*" />
                                    </Grid.RowDefinitions>
                                    <Grid Grid.Row="0">
                                        <Grid.ColumnDefinitions>
                                            <ColumnDefinition Width="*" />
                                            <ColumnDefinition Width="*" />
                                            <ColumnDefinition Width="50" />
                                        </Grid.ColumnDefinitions>
                                            <TextBlock Style="{StaticResource TBHyperlinkStyle}" Text="{Binding Printer.Name}" Grid.Column="0" Margin="2" />
                                            <TextBlock Text="{Binding Printer.Status}" Grid.Column="1" Margin="2"/>
                                        <Image Grid.Column="2" Margin="2"  />
                                    </Grid>
                                    <TextBlock Text="{Binding Printer.Debug}" Grid.Row="1"/>
                                </Grid>
                            <Button Grid.Column="1" Content="Pause"
                                    Command="{Binding Path=PausePrinterCommand}"
                                    ></Button>
                        </Grid>

                        </StackPanel>
                        </Border>
                    </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
        </DockPanel>
    </Border>

</DockPanel>

Und hier ist mein ViewModel dafür:

 public class MainWindowViewModel:ViewModelBase
{
    #region Fields
    private ObservableCollection<PrinterViewModel> _Printers = new ObservableCollection<PrinterViewModel>();
    #endregion Fields

    #region Properties
    public ObservableCollection<PrinterViewModel> Printers
    {
        get
        {
            if(_Printers==null)
                LoadPrinters();
            return _Printers;
        }
    }
    #endregion Properties

    #region Constructor
    public MainWindowViewModel()
    {
        base.DisplayName = Resources.MainWindowViewModel_DisplayName;

        //bind commands
        RefreshPrintersCommand = new RelayCommand(param =>this.LoadPrinters());
        PausePrinterCommand = new RelayCommand( param => this.PausePrinter(param));
    }
    #endregion Constructor
    #region Private Members

    private void LoadPrinters()
    {
        PrintersRepository pr = new PrintersRepository(Config.SettingsLoader.GetPrintServers());
        _Printers.Clear();
        pr.GetPrinters().ForEach(i =>
            _Printers.Add(new PrinterViewModel(i)));
        OnPropertyChanged("Printers");
    }
    private void PausePrinter(object printerFullName)
    {
        var p = _Printers.Where(i => i.Printer.FullName == printerFullName as string);
    }
    #endregion Private Members

    #region Commands
    public ICommand RefreshPrintersCommand
    {
        get;
        private set;
    }
    public ICommand PausePrinterCommand
    {
        get;
        private set;
    }

    #endregion Commands
}

Hier ist mein PrinterViewModel:

 public class PrinterViewModel:ViewModelBase
{
    private Printer _Printer;

    private RelayCommand _PauseCommand;
    public PrinterViewModel(Printer p)
    {
        _Printer = p;

    }
    public Printer Printer { get { return _Printer; } }

    public RelayCommand PauseCommand
    {
        get
        {
            if (_PauseCommand == null)
                _PauseCommand = new RelayCommand(param=>_Printer.Pause());
            return _PauseCommand;
        }
    }

}

Bitte hilfe! Warum kann ich das nicht bekommen?

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