ReviewWindow.xaml

<Window x:Class="PatchReviewer.ReviewWindow"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:self="clr-namespace:PatchReviewer"
             mc:Ignorable="d" 
             d:DesignHeight="800" d:DesignWidth="1200"
             DataContext="{Binding RelativeSource={RelativeSource Self}}">

    <Window.Resources>
        <ResourceDictionary Source="AppStyle.xaml" />
    </Window.Resources>

    <Window.CommandBindings>
        <CommandBinding Command="Save" CanExecute="CanExecuteSave" Executed="ExecuteSave"></CommandBinding>
        <CommandBinding Command="self:Commands.Reload" CanExecute="CanExecuteReloadFile" Executed="ExecuteReloadFile"></CommandBinding>
        <CommandBinding Command="self:Commands.RepatchFile" CanExecute="CanExecuteRepatchFile" Executed="ExecuteRepatchFile"></CommandBinding>
        <CommandBinding Command="self:Commands.RediffFile" CanExecute="CanExecuteRediffFile" Executed="ExecuteRediffFile"></CommandBinding>
        <CommandBinding Command="self:Commands.NextDiff" CanExecute="CanExecuteNextReviewItem" Executed="ExecuteNextReviewItem"></CommandBinding>
        <CommandBinding Command="self:Commands.PrevDiff" CanExecute="CanExecutePrevReviewItem" Executed="ExecutePrevReviewItem"></CommandBinding>
        <CommandBinding Command="self:Commands.Rediff" CanExecute="CanExecuteRediff" Executed="ExecuteRediff"></CommandBinding>
        <CommandBinding Command="self:Commands.Revert" CanExecute="CanExecuteRevert" Executed="ExecuteRevert"></CommandBinding>
        <CommandBinding Command="self:Commands.ApprovePatch" CanExecute="CanExecuteApprove" Executed="ExecuteApprove"></CommandBinding>
        <CommandBinding Command="self:Commands.DeletePatch" CanExecute="CanExecuteRemove" Executed="ExecuteRemove"></CommandBinding>
    </Window.CommandBindings>

    <DockPanel>
        <ToolBar DockPanel.Dock="Top">
            <Button Command="Save" ToolTip="Save File">
                <Image Source="Images/Save.png" Style="{StaticResource ImageEnabled}" />
            </Button>
            <Button Command="self:Commands.Reload" ToolTip="Reload File">
                <Image Source="Images/Reload.png" Style="{StaticResource ImageEnabled}" />
            </Button>
            <Separator/>
            <Button Command="self:Commands.RepatchFile" ToolTip="Repatch File">
                <Image Source="Images/Patch.png" Style="{StaticResource ImageEnabled}" />
            </Button>
            <Button Command="self:Commands.RediffFile" ToolTip="Rediff File">
                <Image Source="Images/Compare.png" Style="{StaticResource ImageEnabled}" />
            </Button>
            <Separator/>
            <Button Command="self:Commands.NextDiff" ToolTip="Next Review (Alt+Down)">
                <Image Source="Images/NextDiff.png" Style="{StaticResource ImageEnabled}" />
            </Button>
            <Button Command="self:Commands.PrevDiff" ToolTip="Previous Review (Alt+Up)">
                <Image Source="Images/PrevDiff.png" Style="{StaticResource ImageEnabled}" />
            </Button>
            <Separator/>
            <Button Command="self:Commands.ApprovePatch" ToolTip="Approve Patch (F2)">
                <Image Source="Images/Accept.png" Style="{StaticResource ImageEnabled}" />
            </Button>
            <Button Command="self:Commands.DeletePatch" ToolTip="Delete Patch (F3)">
                <Image Source="Images/Delete.png" Style="{StaticResource ImageEnabled}" />
            </Button>
            <Separator/>
            <Button Command="self:Commands.Rediff" ToolTip="Recalculate Diff (F5)">
                <Image Source="Images/Refresh.png" Style="{StaticResource ImageEnabled}" />
            </Button>
            <Button Command="self:Commands.Revert" ToolTip="Revert (Ctrl+R)">
                <Image Source="Images/Revert.png" Style="{StaticResource ImageEnabled}" />
            </Button>
        </ToolBar>
        <Grid>
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="400" MinWidth="100"/>
                <ColumnDefinition Width="5" />
                <ColumnDefinition Width="*" MinWidth="100" />
            </Grid.ColumnDefinitions>
            <TreeView Name="treeView" 
                      ItemsSource="{Binding Files}" 
                      SelectedItemChanged="TreeView_OnSelectedItemChanged" 
                      ScrollViewer.HorizontalScrollBarVisibility="Disabled">
                <TreeView.ItemContainerStyle>
                    <Style TargetType="TreeViewItem">
                        <!-- <Setter Property="Margin" Value="-15, 0, 0, 0"/>-->
                        <Setter Property="Padding" Value="0"/>
                    </Style>
                </TreeView.ItemContainerStyle>
                <TreeView.Resources>
                    <!-- Style the inactive selection the same as active -->
                    <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrushKey}"
                                     Color="{DynamicResource {x:Static SystemColors.HighlightColorKey}}" />
                    <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightTextBrushKey}"
                                     Color="{DynamicResource {x:Static SystemColors.HighlightTextColorKey}}"/>


                    <HierarchicalDataTemplate DataType="{x:Type self:FilePatcherViewModel}" ItemsSource="{Binding Children}">
                        <TextBlock Text="{Binding LabelWithModifiedIndicator}" Background="{Binding Status, Converter={StaticResource StatusBrushConverter}}"/>
                    </HierarchicalDataTemplate>
                    <DataTemplate DataType="{x:Type self:ResultViewModel}">
                        <StackPanel Orientation="Horizontal" 
                                    Background="{Binding Status, Converter={StaticResource StatusBrushConverter}}">
                            <TextBlock Text="{Binding MovedPatchCountText}" Width="30"/>
                            <TextBlock Text="{Binding LabelWithModifiedIndicator}"/>
                        </StackPanel>
                    </DataTemplate>
                </TreeView.Resources>
            </TreeView>
            <GridSplitter Grid.Column="1" Width="5" HorizontalAlignment="Center" />
			<DockPanel Grid.Column="2" >
                <Label Name="titleLabel" DockPanel.Dock="Top" HorizontalContentAlignment="Center" FontFamily="Courier New" FontWeight="Bold" BorderBrush="{DynamicResource {x:Static SystemColors.ActiveBorderBrushKey}}" Margin="2"
                       Content="{Binding Title}"
                       Background="{Binding Status, Converter={StaticResource StatusBrushConverter}}">
                </Label>
                <TabControl x:Name="tabControl" SelectionChanged="TabControl_OnSelectionChanged" Padding="0">
                    <TabItem Header="File" x:Name="fileTab">
                        <self:SideBySide x:Name="filePanel"/>
                    </TabItem>
                    <TabItem Header="Patch" x:Name="patchTab">
                        <self:SideBySide x:Name="patchPanel"/>
                    </TabItem>
                </TabControl>

            </DockPanel>
        </Grid>
    </DockPanel>
</Window>