AvalonDock and MVVM

<Window x:Class="SampleApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:SampleApp"
        xmlns:ad="clr-namespace:AvalonDock;assembly=AvalonDock"
        xmlns:ViewModels="clr-namespace:SampleApp.ViewModels;assembly=SampleApp.ViewModels"
        xmlns:AvalonDockMVVM="clr-namespace:AvalonDockMVVM;assembly=AvalonDockMVVM"
        x:Name="mainWindow"
        Title="{Binding Title}" 
        Closing="Window_Closing"
        >
    <Window.Resources>

        <RoutedUICommand x:Key="Commands.NewFile" />
        <RoutedUICommand x:Key="Commands.OpenFile" />
        <RoutedUICommand x:Key="Commands.SaveFile" />
        <RoutedUICommand x:Key="Commands.SaveFileAs" />
        <RoutedUICommand x:Key="Commands.SaveAllFiles" />
        <RoutedUICommand x:Key="Commands.CloseFile" />
        <RoutedUICommand x:Key="Commands.CloseAllFiles" />
        <RoutedUICommand x:Key="Commands.ShowAllPanes" />
        <RoutedUICommand x:Key="Commands.HideAllPanes" />
        <RoutedUICommand x:Key="Commands.Exit" />
        
        <!-- 
        Data template for displaying tabbed documents.
        This is really simple they are just represented by an AvalonDock
        DocumentContent that contains a simple WPF TextBox.
        -->           
        <DataTemplate
            DataType="{x:Type ViewModels:TextFileDocumentViewModel}"
            >
            <ad:DocumentContent
                Title="{Binding Title}"      
                ToolTip="{Binding ToolTip}"
                >                
                <TextBox
                    Text="{Binding Text, UpdateSourceTrigger=PropertyChanged}" VerticalScrollBarVisibility="Visible" HorizontalScrollBarVisibility="Auto" TextWrapping="Wrap" />
            </ad:DocumentContent>
        </DataTemplate>

        <!--
        The DataTemplate for the 'Open Documents' pane.
        This uses an AvalonDock DockableContent that contains an instance of the
        OpenDocumentPaneView user control.
        -->
        <DataTemplate
            DataType="{x:Type ViewModels:OpenDocumentsPaneViewModel}"
            >
            <ad:DockableContent
                x:Name="openDocumentsPane"
                Title="Open Documents"
                AvalonDockMVVM:AvalonDockHost.IsPaneVisible="{Binding IsVisible}"
                >
                <local:OpenDocumentsPaneView />
            </ad:DockableContent>
        </DataTemplate>

        <!-- 
        The DataTemplate for the 'Document Overview' pane.
        This uses an AvalonDock DockableContent that contains an instance of the 
        DocumentOverviewView user control.
        -->
        <DataTemplate
            DataType="{x:Type ViewModels:DocumentOverviewPaneViewModel}"
            >
            <ad:DockableContent
                x:Name="documentOverviewPane"
                Title="Document Overview"
                AvalonDockMVVM:AvalonDockHost.IsPaneVisible="{Binding IsVisible}"
                >
                <local:DocumentOverviewPaneView />
            </ad:DockableContent>
        </DataTemplate>

    </Window.Resources>
    <Window.CommandBindings>
        <CommandBinding 
            Command="{StaticResource Commands.NewFile}"
            Executed="NewFile_Executed"
            />
        <CommandBinding 
            Command="{StaticResource Commands.OpenFile}"
            Executed="OpenFile_Executed"
            />
        <CommandBinding 
            Command="{StaticResource Commands.SaveFile}"
            Executed="SaveFile_Executed"
            />
        <CommandBinding 
            Command="{StaticResource Commands.SaveFileAs}"
            Executed="SaveFileAs_Executed"
            />
        <CommandBinding 
            Command="{StaticResource Commands.SaveAllFiles}"
            Executed="SaveAllFiles_Executed"
            />
        <CommandBinding 
            Command="{StaticResource Commands.CloseFile}"
            Executed="CloseFile_Executed"
            />
        <CommandBinding 
            Command="{StaticResource Commands.CloseAllFiles}"
            Executed="CloseAllFiles_Executed"
            />
        <CommandBinding 
            Command="{StaticResource Commands.ShowAllPanes}"
            Executed="ShowAllPanes_Executed"
            />
        <CommandBinding 
            Command="{StaticResource Commands.HideAllPanes}"
            Executed="HideAllPanes_Executed"
            />
        <CommandBinding 
            Command="{StaticResource Commands.Exit}"
            Executed="Exit_Executed"
            />
    </Window.CommandBindings>
    <Window.InputBindings>
        <KeyBinding
			Key="N"
            Modifiers="Control"
			Command="{StaticResource Commands.NewFile}"
			/>
        <KeyBinding
			Key="O"
            Modifiers="Control"
			Command="{StaticResource Commands.OpenFile}"
			/>
        <KeyBinding
			Key="S"
            Modifiers="Control"
			Command="{StaticResource Commands.SaveFile}"
			/>
    </Window.InputBindings>
    <DockPanel>
        <Menu
            DockPanel.Dock="Top"
            >
            <MenuItem
                Header="_File"
                >
                <MenuItem
                    Header="_New File"
                    Command="{StaticResource Commands.NewFile}"
                    />
                <MenuItem
                    Header="_Open File"
                    Command="{StaticResource Commands.OpenFile}"
                    />
                <Separator />
                <MenuItem
                    Header="_Close File"
                    Command="{StaticResource Commands.CloseFile}"
                    />
                <MenuItem
                    Header="C_lose All Files"
                    Command="{StaticResource Commands.CloseAllFiles}"
                    />
                <Separator />
                <MenuItem
                    Header="_Save File"
                    Command="{StaticResource Commands.SaveFile}"
                    />
                <MenuItem
                    Header="Save File _As"
                    Command="{StaticResource Commands.SaveFileAs}"
                    />
                <MenuItem
                    Header="Save All F_iles"
                    Command="{StaticResource Commands.SaveAllFiles}"
                    />
                <Separator />
                <MenuItem
                    Header="E_xit"
                    Command="{StaticResource Commands.Exit}"
                    />
            </MenuItem>
            <MenuItem
                Header="_View"
                >
                <MenuItem
                    Header="_Document Overview"
                    IsChecked="{Binding DocumentOverviewPaneViewModel.IsVisible}"
                    IsCheckable="True"
                    />
                <MenuItem
                    Header="_Open Documents"
                    IsChecked="{Binding OpenDocumentsPaneViewModel.IsVisible}"
                    IsCheckable="True"
                    />
                <Separator />
                <MenuItem
                    Header="_Show All"
                    Command="{StaticResource Commands.ShowAllPanes}"
                    />
                <MenuItem
                    Header="_Hide All"
                    Command="{StaticResource Commands.HideAllPanes}"
                    />
            </MenuItem>
        </Menu>

        <AvalonDockMVVM:AvalonDockHost
            x:Name="avalonDockHost"
            Panes="{Binding Panes}"
            Documents="{Binding Documents}"
            ActiveDocument="{Binding ActiveDocument}"
            ActivePane="{Binding ActivePane}"
            AvalonDockLoaded="avalonDockHost_AvalonDockLoaded"
            DocumentClosing="avalonDockHost_DocumentClosing"
            />
    </DockPanel>
</Window>