Neptune/Neptune/View/Windows/MainWindow.axaml

<glitonea:WindowEx x:Class="Neptune.View.Windows.MainWindow"
                   xmlns="https://github.com/avaloniaui"
                   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                   xmlns:glitonea="clr-namespace:Glitonea;assembly=Glitonea"
                   xmlns:mvvm="clr-namespace:Glitonea.Mvvm;assembly=Glitonea"
                   xmlns:vm="clr-namespace:Neptune.ViewModel.Windows"
                   xmlns:controls="clr-namespace:Neptune.View.Controls"
                   xmlns:view="clr-namespace:Neptune.View.Windows"
                   Name="WindowRoot"
                   Title="Neptune"
                   DataContext="{mvvm:DataContextSource vm:MainWindowViewModel}">
    <Grid RowDefinitions="Auto,*">
        <Menu Grid.Row="0"
              Margin="0,4,0,0"
              Height="26"
              BorderBrush="{StaticResource NeptuneDarkBorderBrush}"
              BorderThickness="0,0,0,1">
            <MenuItem Header="_File">
                <MenuItem Header="_Open source tree"
                          Command="{Binding BrowseForProjectDirectory}"
                          Icon="{StaticResource NeptuneIconOpenFolder_16}"
                          InputGesture="Ctrl+O"
                          HotKey="Ctrl+O" />

                <MenuItem Name="RecentsMenuItem"
                          Header="Open _recent"
                          Items="{Binding RecentProjects}"
                          Command="{Binding LoadProject}"
                          CommandParameter="{Binding #RecentsMenuItem.Selection.SelectedItem}"
                          IsEnabled="{Binding !!RecentProjects.Count}"
                          Icon="{StaticResource NeptuneIconHistory_16}"
                          InputGesture="Ctrl+R"
                          HotKey="Ctrl+R" />

                <MenuItem Header="_Save"
                          Command="{Binding SaveCurrentProject}"
                          IsEnabled="{Binding IsProjectLoaded}"
                          Icon="{StaticResource NeptuneIconSave_16}"
                          InputGesture="Ctrl+S"
                          HotKey="Ctrl+S" />

                <MenuItem Header="_Close project"
                          Command="{Binding CloseCurrentProject}"
                          IsEnabled="{Binding IsProjectLoaded}"
                          InputGesture="Ctrl+Alt+C"
                          HotKey="Ctrl+Alt+C" />

                <Separator />

                <MenuItem Header="_Quit"
                          Command="{Binding ExitApplication}"
                          Icon="{StaticResource NeptuneIconExit_16}"
                          InputGesture="Ctrl+Q"
                          HotKey="Ctrl+Q" />
            </MenuItem>

            <MenuItem Header="Edit" />
            <MenuItem Header="View" />
            
            <MenuItem Header="Help">
                <MenuItem Header="Documentation" />
                <MenuItem Header="Report a bug" />
                
                <Separator />
                
                <MenuItem Header="About this program" />
            </MenuItem>
        </Menu>

        <Grid Grid.Row="1">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="{Binding GridSplitterPosition, Mode=TwoWay}"
                                  MinWidth="35" />
                <ColumnDefinition Width="3" />
                <ColumnDefinition Width="*" />
            </Grid.ColumnDefinitions>

            <Grid Grid.Column="0"
                  HorizontalAlignment="Stretch"
                  IsVisible="{Binding IsProjectLoaded}">
                <controls:ProjectExplorer />
            </Grid>

            <GridSplitter Grid.Column="1"
                          Name="MainViewSplitter"
                          BorderBrush="{StaticResource NeptuneBackgroundBrush}"
                          BorderThickness="0,0,2,0"
                          Background="{StaticResource NeptuneDarkBorderBrush}"
                          IsVisible="{Binding IsProjectLoaded}" />

            <Grid Grid.Column="2"
                  Name="EditorRoot"
                  Background="{StaticResource NeptuneBackgroundBrush}">
                <Interaction.Behaviors>
                    <DataTriggerBehavior Binding="{Binding IsProjectLoaded}"
                                         ComparisonCondition="Equal"
                                         Value="True">
                        <ChangePropertyAction TargetObject="EditorRoot"
                                              PropertyName="Background"
                                              Value="{StaticResource NeptuneDarkBackgroundBrush}" />

                        <ChangePropertyAction TargetObject="MainViewSplitter"
                                              PropertyName="BorderBrush"
                                              Value="{StaticResource NeptuneDarkBackgroundBrush}" />
                    </DataTriggerBehavior>

                    <DataTriggerBehavior Binding="{Binding IsProjectLoaded}"
                                         ComparisonCondition="Equal"
                                         Value="False">
                        <ChangePropertyAction TargetObject="EditorRoot"
                                              PropertyName="Background"
                                              Value="{StaticResource NeptuneBackgroundBrush}" />

                        <ChangePropertyAction TargetObject="MainViewSplitter"
                                              PropertyName="BorderBrush"
                                              Value="{StaticResource NeptuneBackgroundBrush}" />
                    </DataTriggerBehavior>
                </Interaction.Behaviors>

                <controls:EditorHost IsVisible="{Binding !!SelectedConfigMember}" />
            </Grid>

            <Grid VerticalAlignment="Center"
                  HorizontalAlignment="Center"
                  IsVisible="{Binding !IsProjectLoaded}"
                  ZIndex="999"
                  Grid.ColumnSpan="3"
                  Grid.ColumnDefinitions="Auto,Auto,Auto"
                  Grid.RowDefinitions="Auto,Auto">
                <TextBlock Text="No project open!"
                           Grid.Row="0"
                           Grid.ColumnSpan="3"
                           FontSize="18"
                           FontWeight="SemiLight"
                           HorizontalAlignment="Center"
                           Opacity="0.4" />

                <TextBlock Grid.Row="1"
                           Grid.Column="0"
                           Text="Use "
                           FontSize="18"
                           FontWeight="SemiLight"
                           HorizontalAlignment="Center"
                           Opacity="0.4" />

                <TextBlock Grid.Row="1"
                           Grid.Column="1"
                           Text="File > Open source tree (Ctrl+O)"
                           FontSize="18"
                           FontWeight="SemiLight"
                           HorizontalAlignment="Center"
                           Opacity="0.8" />

                <TextBlock Grid.Row="1"
                           Grid.Column="2"
                           Text=" and browse for 2009scape server directory."
                           FontSize="18"
                           FontWeight="SemiLight"
                           HorizontalAlignment="Center"
                           Opacity="0.4" />
            </Grid>
        </Grid>
    </Grid>
</glitonea:WindowEx>