<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="WpfApplication.MainWindow"
    Height="350" Width="525"
    WindowStartupLocation="CenterScreen"
    WindowStyle="None"
    AllowsTransparency="True"
    Background="Blue">
    <Window.Resources>
        <ResourceDictionary>
            <Style x:Key="NoBordersButton" TargetType="Button">
                <Setter Property="Background" Value="Transparent"/>
                <Setter Property="BorderThickness" Value="1"/>
                <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
                <Setter Property="HorizontalContentAlignment" Value="Center"/>
                <Setter Property="VerticalContentAlignment" Value="Center"/>
                <Setter Property="Padding" Value="1"/>
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="Button">
                            <Grid x:Name="Chrome" Background="{TemplateBinding Background}" SnapsToDevicePixels="true">
                                <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" RecognizesAccessKey="True" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                            </Grid>
                            <ControlTemplate.Triggers>
                                <Trigger Property="IsEnabled" Value="false">
                                    <Setter Property="Foreground" Value="#ADADAD"/>
                                    <Setter Property="Opacity" TargetName="Chrome" Value="0.5"/>
                                </Trigger>
                            </ControlTemplate.Triggers>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>
        </ResourceDictionary>
    </Window.Resources>
    <Grid>
        <Grid.Style>
            <Style TargetType="Grid">
                <Setter Property="Margin" Value="0"/>
                <Style.Triggers>
                    <DataTrigger Binding="{Binding WindowState, RelativeSource={RelativeSource AncestorType=Window}}" 
                                 Value="Maximized">
                        <Setter Property="Margin" Value="5"/>
                    </DataTrigger>
                </Style.Triggers>
            </Style>
        </Grid.Style>
        <Grid.RowDefinitions>
            <RowDefinition Height="32"/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <Grid Grid.Row="0">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="32"/>
                <ColumnDefinition/>
                <ColumnDefinition Width="Auto"/>
            </Grid.ColumnDefinitions>
            <Button Grid.Column="0" Style="{StaticResource NoBordersButton}" Cursor="Hand">
                <Button.Content>
                    <Image Source="Images/back.png" Width="24" Height="24"/>
                </Button.Content>
            </Button>
            <TextBlock Grid.Column="1" Text="MainWindow" Foreground="White" 
                       HorizontalAlignment="Center"
                       VerticalAlignment="Center"/>
            <StackPanel Grid.Column="2" Orientation="Horizontal">
                <Button Style="{StaticResource NoBordersButton}" Cursor="Hand" Click="OnMinimizeClick">
                    <Button.Content>
                        <Image Source="Images/minimize.png" Width="24" Height="24"/>
                    </Button.Content>
                </Button>
                <Button  Style="{StaticResource NoBordersButton}" Cursor="Hand" Click="OnMaximizeClick">
                    <Button.Content>
                        <Image Source="Images/maximize.png" Width="24" Height="24"/>
                    </Button.Content>
                </Button>
                <Button Style="{StaticResource NoBordersButton}" Cursor="Hand" Click="OnCloseClick">
                    <Button.Content>
                        <Image Source="Images/close.png" Width="24" Height="24"/>
                    </Button.Content>
                </Button>
            </StackPanel>
        </Grid>
    </Grid>
</Window>