Custom Window

public class CustomWnd : System.Windows.Window

    {

        static CustomWnd()

        {

            DefaultStyleKeyProperty.OverrideMetadata(typeof(CustomWnd), new FrameworkPropertyMetadata(typeof(CustomWnd)));

        }

        public CustomWnd()

        {

            CommandBindings.Add(new CommandBinding(SystemCommands.CloseWindowCommand, CloseWindow));

            CommandBindings.Add(new CommandBinding(SystemCommands.MaximizeWindowCommand, MaximizeWindow, CanResizeWindow));

            CommandBindings.Add(new CommandBinding(SystemCommands.MinimizeWindowCommand, MinimizeWindow));

            CommandBindings.Add(new CommandBinding(SystemCommands.RestoreWindowCommand, RestoreWindow, CanResizeWindow));

        }

        private void CanResizeWindow(object sender, CanExecuteRoutedEventArgs e)

        {

            e.CanExecute = ResizeMode == ResizeMode.CanResize || ResizeMode == ResizeMode.CanResizeWithGrip;

        }

        private void RestoreWindow(object sender, ExecutedRoutedEventArgs e)

        {

            this.WindowState = System.Windows.WindowState.Normal;

        }

        private void MinimizeWindow(object sender, ExecutedRoutedEventArgs e)

        {

            this.WindowState = System.Windows.WindowState.Minimized;

        }

        private void MaximizeWindow(object sender, ExecutedRoutedEventArgs e)

        {

            this.WindowState = System.Windows.WindowState.Maximized;

        }

        private void CloseWindow(object sender, ExecutedRoutedEventArgs e)

        {

            this.Close();

        }

    }

<Style TargetType="{x:Type wnd:CustomWnd}" BasedOn="{StaticResource ResourceKey={x:Type Window}}">

        <Setter Property="WindowStyle" Value="SingleBorderWindow"/>

        <Setter Property="AllowsTransparency" Value="False"/>

        <Setter Property="BorderBrush" Value="Green"/>

        <Setter Property="BorderThickness" Value="1"/>

        <Setter Property="UseLayoutRounding" Value="True"/>

        <Setter Property="WindowChrome.WindowChrome">

            <Setter.Value>

                <WindowChrome CornerRadius="0" GlassFrameThickness="1" UseAeroCaptionButtons="False" NonClientFrameEdges="None" />

            </Setter.Value>

        </Setter>

        <Setter Property="Template">

            <Setter.Value>

                <ControlTemplate TargetType="{x:Type wnd:CustomWnd}">

                    <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">

                        <Grid x:Name="LayoutRoot" Background="{TemplateBinding Background}">

                            <Grid.RowDefinitions>

                                <RowDefinition Height="Auto" />

                                <RowDefinition Height="*" />

                            </Grid.RowDefinitions>

                            <Grid x:Name="PART_WindowTitleGrid" Grid.Row="0" Height="30" Background="{TemplateBinding BorderBrush}">

                                <StackPanel Orientation="Horizontal" HorizontalAlignment="Left" VerticalAlignment="Center" Margin="10,0">

                                    <Image Source="{TemplateBinding Icon}" Margin="0,0,5,0"/>

                                    <TextBlock Text="{TemplateBinding Title}" Foreground="{TemplateBinding Foreground}" VerticalAlignment="Center"/>

                                </StackPanel>

                                <StackPanel Orientation="Horizontal" HorizontalAlignment="Right" VerticalAlignment="Top" Margin="5,0">

                                    <Button Width="24" Height="24" IsTabStop="False" WindowChrome.IsHitTestVisibleInChrome="True" Style="{StaticResource SysBtnStyle}" Command="{x:Static SystemCommands.MinimizeWindowCommand}">

                                        <Button.Content>

                                            <Path Stroke="White" StrokeThickness="2" Fill="Transparent" Data="M0,0 L10,0" Margin="0,5,0,0" HorizontalAlignment="Center" VerticalAlignment="Center"/>

                                        </Button.Content>

                                    </Button>

                                    <Button x:Name="PART_MAX" Width="24" Height="24" IsTabStop="False" WindowChrome.IsHitTestVisibleInChrome="True" Style="{StaticResource SysBtnStyle}"/>

                                    <Button Width="24" Height="24" IsTabStop="False" WindowChrome.IsHitTestVisibleInChrome="True" Style="{StaticResource SysCloseBtnStyle}" Command="{x:Static SystemCommands.CloseWindowCommand}">

                                        <Button.Content>

                                            <Path Stroke="White" StrokeThickness="2" Fill="Transparent" Data="M0,0 L7.07,7.07 M0,7.07 L7.07,0" HorizontalAlignment="Center" VerticalAlignment="Center"/>

                                        </Button.Content>

                                    </Button>

                                </StackPanel>

                            </Grid>

                            <AdornerDecorator Grid.Row="1" KeyboardNavigation.IsTabStop="False">

                                <ContentPresenter x:Name="MainContentPresenter" KeyboardNavigation.TabNavigation="Cycle" />

                            </AdornerDecorator>

                            <ResizeGrip x:Name="ResizeGrip" HorizontalAlignment="Right" VerticalAlignment="Bottom" Grid.Row="1"

                                            IsTabStop="False" Visibility="Hidden" WindowChrome.ResizeGripDirection="BottomRight" />

                        </Grid>

                    </Border>

                    <ControlTemplate.Triggers>

                        <Trigger Property="WindowState" Value="Maximized">

                            <Setter TargetName="PART_MAX" Property="Command" Value="{x:Static SystemCommands.RestoreWindowCommand}"/>

                            <Setter TargetName="PART_MAX" Property="Content">

                                <Setter.Value>

                                    <Path Stroke="White" StrokeThickness="2" Fill="Transparent" Data="M0,3 L5,3 L5,8 L0,8Z M3,3 L3,0 L8,0 L8,5 L5,5" HorizontalAlignment="Center" VerticalAlignment="Center"/>

                                </Setter.Value>

                            </Setter>

                        </Trigger>

                        <Trigger Property="WindowState" Value="Normal">

                            <Setter TargetName="PART_MAX" Property="Command" Value="{x:Static SystemCommands.MaximizeWindowCommand}"/>

                            <Setter TargetName="PART_MAX" Property="Content">

                                <Setter.Value>

                                    <Path Stroke="White" StrokeThickness="2" Fill="Transparent" Data="M0,0 L7.07,0 L7.07,7.07 L0,7.07Z" HorizontalAlignment="Center" VerticalAlignment="Center"/>

                                </Setter.Value>

                            </Setter>

                        </Trigger>

                        <Trigger Property="IsActive" Value="False">

                            <Setter Property="BorderBrush" Value="#FF6F7785" />

                        </Trigger>

                        <Trigger Property="ResizeMode" Value="NoResize">

                            <Setter TargetName="PART_MAX" Property="Visibility" Value="Collapsed" />

                        </Trigger>

                        <MultiTrigger>

                            <MultiTrigger.Conditions>

                                <Condition Property="ResizeMode" Value="CanResizeWithGrip" />

                                <Condition Property="WindowState" Value="Normal" />

                            </MultiTrigger.Conditions>

                            <Setter TargetName="ResizeGrip" Property="Visibility" Value="Visible" />

                        </MultiTrigger>

                    </ControlTemplate.Triggers>

                </ControlTemplate>

            </Setter.Value>

        </Setter>

    </Style>